Etymology
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wee (adj.)
"extremely small," mid-15c., from earlier noun use in sense of "quantity, amount" (such as a littel wei "a little thing or amount," c. 1300), from Old English wæge "weight, unit of weight," from Proto-Germanic *wego, from PIE root *wegh- "to go, move, transport in a vehicle." The original sense was of motion, which led to that of lifting, then to that of "measure the weight of" (compare weigh, from the same source).

Adjectival use wee bit apparently developed as parallel to such forms as a bit thing "a little thing." Wee hours "hours after midnight" is attested by 1891, from Scottish phrase wee sma' hours (1819); so called for their low numbers. Wee folk "faeries" is recorded from 1819. Weeny "tiny, small" is from 1790.
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weenie (n.)
"frankfurter," 1906, with slang sense of "penis" following soon after, from German wienerwurst "Vienna sausage" (see wiener). Meaning "ineffectual person, effeminate young man" is slang from 1963; pejorative sense via penis shape, or perhaps from weenie in the sense of "small" (see wee).
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peewee (adj.)

1877, "small, tiny; for children," a dialect word, possibly a varied reduplication of wee. Attested earlier (1848) as a noun meaning "a small marble." (Baseball Hall-of-Famer Harold "Peewee" Reese got his nickname because he was a marbles champion before he became a Dodgers shortstop.)

As a type of bird (variously applied on different continents) it is attested from 1886, imitative of a bird cry. Earlier peeweep (1825), and compare peewit.

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hour (n.)

c. 1200, "divine office prescribed for each of the seven canonical hours; the daily service at the canonical hours;" c. 1300, "time of day appointed for prayer, one of the seven canonical hours," from Old French ore, hore "canonical hour; one-twelfth of a day" (sunrise to sunset), from Latin hora "an hour;" poetically "time of year, season," from Greek hōra a word used to indicate any limited time within a year, month, or day (from PIE *yor-a-, from root *yer- "year, season;" see year).

Church sense is oldest in English. Meaning "one of the 24 equal parts of a natural solar day (time from one sunrise to the next), equal hour; definite time of day or night reckoned in equal hours," and that of "one of the 12 equal parts of an artificial day (sunrise to sunset) or night, varying in duration according to the season; definite time of day or night reckoned in unequal hours" are from late 14c. In the Middle Ages the planets were held to rule over the unequal hours. As late as 16c. distinction sometimes was made in English between temporary (unequal) hours and sidereal (equal) ones. Meaning "time of a particular happening; the time for a given activity" (as in hour of death) is mid-14c.

The h- has persisted in this word despite not being pronounced since Roman times. Replaced Old English tid, literally "time" (see tide (n.)) and stund "period of time, point of time, hour," from Proto-Germanic *stundo (compare German Stunde "hour"), which is of uncertain origin. German Uhr likewise is from French.

Greek hora could mean "a season; 'the season' (spring or summer)." In classical times it sometimes meant "a part of the day," such as morning, evening, noon, night. The Greek astronomers apparently borrowed the notion of dividing the day into twelve parts (mentioned in Herodotus) from the Babylonians. Night continued to be divided into four watches (see watch (n.)); but because the amount of daylight changed throughout the year, the hours were not fixed or of equal length.

As a measure of distance ("the distance that can be covered in an hour") it is recorded from 1785. At all hours "at all times" is from early 15c. For small hours (those with low numbers) see wee (adj.).

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*wegh- 

Proto-Indo-European root meaning "to go, move, transport in a vehicle."

The root wegh-, "to convey, especially by wheeled vehicle," is found in virtually every branch of Indo-European, including now Anatolian. The root, as well as other widely represented roots such as aks- and nobh-, attests to the presence of the wheel — and vehicles using it — at the time Proto-Indo-European was spoken. [Watkins, p. 96]

It forms all or part of: always; away; convection; convey; convex; convoy; deviate; devious; envoy; evection; earwig; foy; graywacke; impervious; invective; inveigh; invoice; Norway; obviate; obvious; ochlocracy; ogee; pervious; previous; provection; quadrivium; thalweg; trivia; trivial; trivium; vector; vehemence; vehement; vehicle; vex; via; viaduct; viatic; viaticum; vogue; voyage; wacke; wag; waggish; wagon; wain; wall-eyed; wave (n.); way; wee; weigh; weight; wey; wiggle.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit vahati "carries, conveys," vahitram, vahanam "vessel, ship;" Avestan vazaiti "he leads, draws;" Greek okhos "carriage, chariot;" Latin vehere "to carry, convey," vehiculum "carriage, chariot;" Old Church Slavonic vesti "to carry, convey," vozŭ "carriage, chariot;" Russian povozka "small sled;" Lithuanian vežu, vežti "to carry, convey," važis "a small sled;" Old Irish fecht "campaign, journey," fen "carriage, cart;" Welsh gwain "carriage, cart;" Old English wegan "to carry;" Old Norse vegr, Old High German weg "way;" Middle Dutch wagen "wagon."

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dowdy 

1580s (n.), "an aukward, ill-dressed, inelegant woman" [Johnson]; as an adjective, 1670s, "slovenly, shabby in dress" (of women). Perhaps a diminutive of Middle English doude "unattractive woman" (mid-14c.), which is of uncertain origin. Compare Scottish dow "to fade, wither, become dull or flat." In modern use it tends more toward "unfashionable, without style." 

If plaine or homely, wee saie she is a doudie or a slut [Barnabe Riche, "Riche his Farewell to Militarie profession," 1581]
You don't have to be dowdy to be a Christian. [Tammy Faye Bakker, Newsweek, June 8, 1987]

Modern use of dowdy (adj.) is likely a back-formation from the noun. Related: Dowdily; dowdiness.

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brownie (n.)

1510s, "benevolent goblin supposed to haunt old farmhouses in Scotland," diminutive of brown "a wee brown man" (see brown (adj.)).

The brownie was believed to be very useful to the family, particularly if treated well by them, and to the servants, for whom while they slept he was wont to do many pieces of drudgery. In appearance the brownie was said to be meager, shaggy, and wild. [Century Dictionary]

As "small square of rich chocolate cake," often with nuts, 1897. As a brand-name of a type of inexpensive camera, 1900. The name for the junior branch of the Girl Guides or Girl Scouts is by 1916, in reference to their uniform color. Brownie point "notional credit for an achievement; favour in the eyes of another, esp. gained by sycophantic or servile behaviour" [OED] is by 1959, sometimes associated with Brownie in the Scouting sense but is perhaps rather from brown-nose.

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oat (n.)

type of cereal plant, Middle English ote, from Old English ate (plural atan) "grain of the oat plant, wild oats," a word of uncertain origin, possibly from Old Norse eitill "nodule," denoting a single grain, itself of unknown origin. The English word has cognates in Frisian and some Dutch dialects. Famously defined by Johnson as, "A grain, which in England is generally given to horses, but in Scotland supports the people." Related: Oats.

The usual Germanic name is derived from Proto-Germanic *khabran (source also of Old Norse hafri, Dutch haver, source of haversack). Figurative wild oats "youthful excesses" (the notion is "crop that one will regret sowing") is attested by 1560s, in reference to the folly of sowing these instead of good grain. Hence, feel (one's) oats "be lively," 1831, originally American English.

That wilfull and vnruly age, which lacketh rypenes and discretion, and (as wee saye) hath not sowed all theyr wyeld Oates. [Thomas Newton, "Lemnie's Touchstone of complexions," 1576]
Fred: I still want to sow some wild oats!
Lamont: At your age, you don't have no wild oats, you got shredded wheat.
["Sanford and Son"]
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pug (n.)

1560s, a general term of endearment (also puggy), perhaps related to or a variant of puck (n.2); one of the earliest senses of pug is "sprite, imp" (1610s). The sense of "miniature dog" is from 1749 (pug-dog); that of "monkey" is from 1660s, perhaps on the notion of having a pert, ugly face like a little imp.

In John Milesius any man may reade
Of divels in Sarmatia honored
Call'd Kottri or Kibaldi ; such as wee
Pugs and hobgoblins call. Their dwellings bee
In corners of old houses least frequented,
Or beneath stacks of wood ; and these convented
Make fearfull noise in buttries and in dairies,
Robin good-fellowes some, some call them fairies.
[Thomas Heywood, "Hierarchie of the Blessed Angells," 1635]

The word, or identical words, at various times also meant "a husk of grain" (mid-15c.), "a bargeman" (1590s), "a harlot" (c. 1600), and "an upper servant in a great house" (1843), the last, if it is authentic, perhaps with a suggestion of "lap dog."

"I've seen him, father," said Nelly with a consequential air, "the day I was up at Fairfield Court;  he came into Pug's Hole while the old lady was talking to me." For the benefit of the unlearned it should be mentioned that the under-servants "in respectable families" call upper-servants "Pugs;" and that the housekeeper's room is designated as "Pug's Hole." [F.E. Paget, "Warden of Berkingholt," 1843]
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