Etymology
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slang (n.)

1756, "special vocabulary of tramps or thieves" or any set of persons of low character, later "jargon of a particular profession" (1801). The sense of "very informal language characterized by vividness and novelty" is by 1818.

Anatoly Liberman writes here an extensive account of the established origin of the word from the Northern England noun slang "a narrow piece of land running up between other and larger divisions of ground" and the verb slanger "linger, go slowly," which is of Scandinavian origin (compare Norwegian slenge "hang loose, sling, sway, dangle," Danish slænge "to throw, sling"). "Their common denominator seems to be 'to move freely in any direction' " [Liberman]. Noun derivatives of these (Danish slænget, Norwegian slenget) mean "a gang, a band," and Liberman compares Old Norse slangi "tramp" and slangr "going astray" (used of sheep). He writes:

It is not uncommon to associate the place designated for a certain group and those who live there with that group’s language. John Fielding and the early writers who knew the noun slang used the phrase slang patter, as though that patter were a kind of talk belonging to some territory.

So the sense evolution would be from slang "a piece of delimited territory" to "the territory used by tramps for their wandering," to "their camping ground," and finally to "the language used there." The sense shift then passes through itinerant merchants:

Hawkers use a special vocabulary and a special intonation when advertising their wares (think of modern auctioneers), and many disparaging, derisive names characterize their speech; charlatan and quack are among them.

Liberman concludes: 

[Slang] is a dialectal word that reached London from the north and for a long time retained the traces of its low origin. The route was from "territory; turf" to "those who advertise and sell their wares on such a territory," to "the patter used in advertising the wares," and to "vulgar language" (later to “any colorful, informal way of expression”).

The association of the word with thieves and low life faded in the 19c.

[S]lang is a conscious offence against some conventional standard of propriety. A mere vulgarism is not slang, except when it is purposely adopted, and acquires an artificial currency, among some class of persons to whom it is not native. The other distinctive feature of slang is that it is neither part of the ordinary language, nor an attempt to supply its deficiencies. The slang word is a deliberate substitute for a word of the vernacular, just as the characters of a cipher are substitutes for the letters of the alphabet, or as a nickname is a substitute for a personal name. [Henry Bradley, from "Slang," in Encyclopedia Britannica, 11th ed.]


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in- (2)
Origin and meaning of in-

element meaning "into, in, on, upon" (also im-, il-, ir- by assimilation of -n- with following consonant), from Latin in- "in," from PIE root *en "in."

In Old French (and hence in Middle English) this often became en-, which in English had a strong tendency to revert to Latin in-, but not always, which accounts for pairs such as enquire/inquire. There was a native form, which in West Saxon usually appeared as on- (as in Old English onliehtan "to enlighten"), and some of those verbs survived into Middle English (such as inwrite "to inscribe"), but all now seem to be extinct.

Not related to in- (1) "not," which also was a common prefix in Latin, causing confusion: to the Romans impressus could mean "pressed" or "unpressed;" inaudire meant "to hear," but inauditus meant "unheard of;" in Late Latin investigabilis could mean "that may be searched into" or "that cannot be searched into." Latin invocatus was "uncalled, uninvited," but invocare was "to call, appeal to."

The trouble has continued in English; the hesitation over what is meant by inflammable being a commonly cited example. Implume (1610s) meant "to feather," but implumed (c. 1600) meant "unfeathered." Impliable can mean "capable of being implied" (1865) or "inflexible" (1734). Impartible in 17c. could mean "incapable of being divided" or "capable of being imparted." Impassionate can be "free from passion" or it can mean "strongly stirred by passion." Inanimate (adj.) is "lifeless," but Donne uses inanimate (v.) to mean "infuse with life or vigor." Irruption is "a breaking in," but irruptible is "unbreakable."

In addition to improve "use to one's profit," Middle English also had a verb improve meaning "to disprove" (15c.). To inculpate is "to accuse," but inculpable means "not culpable, free from blame." Infestive has meant "troublesome, annoying" (1560s, from infest) and "not festive" (1620s). In Middle English inflexible could mean "incapable of being bent" or "capable of being swayed or moved." In 17c., informed could mean "current in information," formed, animated," or "unformed, formless" ("This was an awkward use" [OED]). Inhabited has meant "dwelt in" (1560s) and "uninhabited" (1610s); inhabitable likewise has been used on opposite senses, a confusion that goes back to Late Latin.

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dog (n.)

"quadruped of the genus Canis," Old English docga, a late, rare word, used in at least one Middle English source in reference specifically to a powerful breed of canine; other early Middle English uses tend to be depreciatory or abusive. Its origin remains one of the great mysteries of English etymology.

The word forced out Old English hund (the general Germanic and Indo-European word, from root from PIE root *kwon-) by 16c. and subsequently was picked up in many continental languages (French dogue (16c.), Danish dogge, German Dogge (16c.). The common Spanish word for "dog," perro, also is a mystery word of unknown origin, perhaps from Iberian. A group of Slavic "dog" words (Old Church Slavonic pisu, Polish pies, Serbo-Croatian pas) likewise is of unknown origin. 

In reference to persons, by c. 1200 in abuse or contempt as "a mean, worthless fellow, currish, sneaking scoundrel." Playfully abusive sense of "rakish man," especially if young, "a sport, a gallant" is from 1610s. Slang meaning "ugly woman" is from 1930s; that of "sexually aggressive man" is from 1950s.  

Many expressions — a dog's life (c. 1600), go to the dogs (1610s), dog-cheap (1520s), etc. — reflect the earlier hard use of the animals as hunting accessories, not pets. In ancient times, "the dog" was the worst throw in dice (attested in Greek, Latin, and Sanskrit, where the word for "the lucky player" was literally "the dog-killer"), which plausibly explains the Greek word for "danger," kindynos, which appears to be "play the dog" (but Beekes is against this).

Notwithstanding, as a dog hath a day, so may I perchance have time to declare it in deeds. [Princess Elizabeth, 1550]

Meaning "something poor or mediocre, a failure" is by 1936 in U.S. slang. From late 14c. as the name for a heavy metal clamp of some kind. Dog's age "a long time" is by 1836. Adjectival phrase dog-eat-dog "ruthlessly competitive" is by 1850s. Phrase put on the dog "get dressed up" (1934) may be from comparison of dog collars to the stiff stand-up shirt collars that in the 1890s were the height of male fashion (and were known as dog-collars from at least 1883).

And Caesar's spirit, ranging for revenge,
With Ate by his side come hot from Hell,
Shall in these confines with a monarch's voice
Cry Havoc! and let slip the dogs of war;
[Shakespeare, "Julius Caesar"]
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club (n.)

c. 1200, "thick stick wielded in the hand and used as a weapon," from Old Norse klubba "cudgel" or a similar Scandinavian source (compare Swedish klubba, Danish klubbe), assimilated from Proto-Germanic *klumbon and related to clump (n.). Old English words for this were sagol, cycgel. Specific sense of "bat or staff used in games" is from mid-15c.

The club suit in the deck of cards (1560s) bears the correct name (Spanish basto, Italian bastone), but the pattern adopted on English decks is the French trefoil. Compare Danish klr, Dutch klaver "a club at cards," literally "a clover."

The sense "company of persons organized to meet for social intercourse or to promote some common object" (1660s) apparently evolved from this word from the verbal sense "gather in a club-like mass" (1620s), then, as a noun, "association of people" (1640s).

We now use the word clubbe for a sodality in a tavern. [John Aubrey, 1659]
Admission to membership of clubs is commonly by ballot. Clubs are now an important feature of social life in all large cities, many of them occupying large buildings containing reading-rooms, libraries, restaurants, etc. [Century Dictionary, 1902]
I got a good mind to join a club and beat you over the head with it. [Rufus T. Firefly] 

Join the club "become one of a number of people having a common experience" is by 1944. Club soda is by 1881, originally a proprietary name (Cantrell & Cochrane, Dublin). Club car is from 1890, American English, originally one well-appointed and reserved for members of a club run by the railway company; later of any railway car fitted with chairs instead of benches and other amenities (1917). Hence club for "class of fares between first-class and transit" (1978).

The club car is one of the most elaborate developments of the entire Commuter idea. It is a comfortable coach, which is rented to a group of responsible men coming either from a single point or a chain of contiguous points. The railroad charges from $250 to $300 a month for the use of this car in addition to the commutation fares, and the "club" arranges dues to cover this cost and the cost of such attendants and supplies as it may elect to place on its roving house. [Edward Hungerford, "The Modern Railroad," 1911]

Club sandwich recorded by 1899 (said to have been invented at Saratoga Country Club in New York), apparently as a type of sandwich served in clubs, or else because its multiple "decks" reminded people of two-decker club cars on railroads.  

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social (adj.)

early 15c., "devoted to or relating to home life;" 1560s as "living with others," from French social (14c.) and directly from Latin socialis "of companionship, of allies; united, living with others; of marriage, conjugal," from socius "companion, ally," probably originally "follower," from PIE *sokw-yo-, suffixed form of root *sekw- (1) "to follow." Compare Old English secg, Old Norse seggr "companion," which seem to have been formed in Germanic on the same notion. Related: Socially.

It is attested by 1660s as "marked by mutual intercourse, enjoyed in the company of others," especially those of similar inclinations. Of a club, etc., "comprised of persons coming together for friendly intercourse," by 1792.

The broader sense of "living or liking to live with others; companionable, disposed to live in companies or communities" is from 1722. Social drinking "consumption of alcohol in a social context" is attested by 1807; social butterfly (1867) is a figurative reference to "flitting" from one social event to another. Social network is attested by 1971; social networking by 1984; social media by 2008.

The meaning "of or pertaining to society as a natural human state," and to its ranks and conditions, is attested by 1695 in Locke. Social contract (1763), the mutual agreement supposed to form the basis of human society, is from translations of Rousseau.

Hence also social science (1785). Social studies as an inclusive term for history, geography, economics, etc., is attested from 1916. Social security "system of state support for needy citizens" is attested from 1907 (the Social Security Act was passed by U.S. Congress in 1935).

And in reference to problems rooted in social conditions, social work (1890); social worker (1886). In late 19c. newspapers, social evil is "prostitution." Social justice is attested by 1718. Specifically of activities, especially by governments, meant to improve the condition of society overall, by 1964.

Social Darwinism "application of the theory of evolution to social situations" is attested from 1887. Social engineering, "application of sociology theory to specific problems" is attested by 1899.

The sense of "of or concerned with fashionable society and the leisured class" is from 1873. Hence social register "published list of those who are socially prominent," attested by 1889, American English; social climber, "one who seeks to advance socially" (1893).

Social distance was originally in a psychological sense in reference to societies (1924); it was used in reference to "physical distance acceptable in social situations" by 1955.

A social war (1660s) is one between allies, especially (with capitals) in reference to the Roman war 90-88 B.C.E. in which the Roman allies (socii) fought for citizenship rights.

I must introduce a parenthetical protest against the abuse of the current term 'social justice'. From meaning 'justice in relations between groups or classes' it may slip into meaning a particular assumption as to what these relations should be; and a course of action might be supported because it represented the aim of 'social justice', which from the point of view of 'justice' was not just. The term 'social justice' is in danger of losing its rational content—which would be replaced by a powerful emotional charge. I believe that I have used the term myself: it should never be employed unless the user is prepared to define clearly what social justice means to him, and why he thinks it just. [T.S. Eliot, footnote in "Notes Towards the Definition of Culture," 1948]
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canoodle (v.)

by 1830, "to cheat, deceive," in an English collection of Irish songs, and also used, punningly, in the lines of an Englishman character in a "grand dramatic melodrama" set in India: "There, thanks to my canoe—we've canoodled those Bramins nicely, and effected a clear retreat to my retreat here." ["The Cataract of the Ganges, or The Rajah's Daughter" by W.T. Moncrieff].

It is used in New Orleans by 1843, also as a noun, "hanky-panky, illicit procedure." After 1848, canoodling or cahoodling turns up in Southern U.S. newspapers with a sense of "political manipulation, back-room deals:

The truth is, while cahoodling at the top of his bent for Taylor, to the friends of the other candidates he professed unalterable devotion to the fortunes of the favorite of each." [North Carolina Standard (Raleigh), June 28, 1848, in an account of political doings from Washington]
Very clever canoodling, this! [North Carolina Times (Raleigh), July 1, 1848, in reference to the sectional wrangling over the Wilmot Proviso.]

Canoodling is frequent in certain North Carolina papers through the 1870s. The Standard (July 12, 1866) writes of cohooting and canoodling.

The Washington (D.C.) Evening Star also used it often from 1854, in columns widely reprinted in the Southern press, but as cahoodling, also, at least once cohoodling [Sept. 29, 1858]. It defines "the cahoodling line" as "those in Washington interested in securing places at a distance for their respective friends" [Sept. 9, 1854]. 

The word seemed to require explanation when it appeared in the northern press. From A Chicago Tribune account (Dec. 14, 1859) from a D.C. correspondent of the fight over Speaker of the House:

He also handed to the Clerk a letter from Douglas denying that Greeley and he ever "cahoodled" in his (Douglas') parlor, or secure his re-election.

It is spelled canoedle in a Pennsylvania paper [Lebanon Daily News, Oct. 17, 1874], but this might have been for humorous effect, as it is in a mock letter to a would-be candidate ("You canoedling unculinary old cucumber, shut up ; you have no chance for Congress, and Cherrington says you are not fit to watch his fish ponds.")

The sense shift toward "to indulge in caresses and fondling endearments" [OED] is attested by 1860s; W.S. Fortey published in an English songbook "And he Said my Dear Maid will you Marry Me?" a woman's comical lament about her wooer:

But he wanted to kiss and canoodle me
So I wouldn't allow it at all!

What is evidently a reworking of the "Ganges" play from 1866 uses canoodling in a way suggestive of fond caressing. [The Western Times, Exeter, Dec. 28, 1866]. Another early use is in Trewman's Exeter Flying Post for Feb. 18, 1874. The newspaper's account of the Cullompton petty session of two days previous includes the case of a young fellow charged with "being on the premises of Mr. R. M. Dawdney, of Pound Down Farm, Silverton, for an unlawful purpose," viz. to spoon with his sweetheart, Dawdney's servant girl, "in the small hours of the morning."

The defendant was directed to pay the expenses and he left the court with the evident impression that "canoodling" by night was sometimes attended with unpleasant results.

In 1869 W.S. Gilbert published "The King of Canoodle-Dum," one of his popular, buffoonish "Bab Ballads." It concerns an English sailor shipwrecked in the West Indies who is taken up by said native "king" and given a life of tropical luxury. Thanks probably to the song, Canoodle-dum seems to have had some currency in England in the 1870s, referring vaguely to peoples in Africa or the Caribbean.

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