Etymology
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part of speech (n.)

"a word viewed as a constituent member of a sentence," c. 1500, translating Latin pars orationis (see parse). The parts of speech are: Noun, adjective, pronoun, verb, adverb, preposition, conjunction, and interjection. Sometimes article and participle are counted among them.

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double talk (n.)

"deliberately unintelligible speech," by 1938, from double (adj.) + talk (n.). Old English had a similar formation in twispræc "double speech, deceit, detraction." An analysis of Chinook jargon from 1913 lists mox wawa "a lie," literally "double talk."

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bon mot (n.)

"witticism, clever or witty saying," 1735, French, literally "good word," from bon "good" + mot "remark, short speech," literally "word" (12c.), from Vulgar Latin *muttum, from Latin muttire "to mutter, mumble, murmur" (see mutter (v.)). The plural is bons mots.

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enfant terrible (n.)
1851, French, literally "terrible child" (see infant + terrible). One whose unorthodox or shocking speech or manners embarrass his associates as a naughty child embarrasses his elders. French also has enfant gâté, "spoiled child," hence "person given excessive adulation."
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cold war (n.)

"nonhostile belligerency," used in print October 1945 by George Orwell; popularized in U.S. c. 1947 by U.S. statesman Bernard Baruch (1870-1965). Hence hot war (1947).

More than any other time in history, mankind faces a crossroads. One path leads to despair and utter hopelessness. The other, to total extinction. Let us pray we have the wisdom to choose correctly. [Woody Allen, from "My Speech to the Graduates," 1979]
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iron curtain (n.)

1794, the name of a fire-protection device to be used in theaters, a literal iron curtain; see iron (n.) + curtain (n.).

The new and exquisitely beautiful theatre of Drury-lane has the peculiar contrivance of an iron-curtain to secure the audience from all danger, in case of fire on the stage. Miss Farren, in the occasional epilogue, delivered on opening this new theatre, pleasantly informs the spectators that, should flames burst out in the part appropriated to the representation, they may comfort themselves with thinking that nothing can be burnt but the scenery and the actors. [The Monthly Review, June 1794]

From 1819 in the figurative sense "impenetrable barrier." In reference to the Soviet occupation of Eastern Europe, famously coined by Winston Churchill March 5, 1946, in speech at Westminster College, Fulton, Missouri, but it had been used earlier in this context (for example by U.S. bureaucrat Allen W. Dulles at a meeting of the Council on Foreign Relations, Dec. 3, 1945). The phrase had been used in the sense of "barrier at the edge of the sphere of influence of the Soviet Union" from 1920. During World War II, Goebbels used it in German (ein eiserner Vorhang) in the same sense. But its popular use in the U.S. dates from Churchill's speech.

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Three Rs (n.)

1824; said to have been given as a toast by Sir William Curtis (1752-1829), a beloved lord mayor of London in the 1820s, who seems to have been a figure of fun to whom many mangled phrases were attributed. Among the toasts he is alleged to have given at public dinners were "The Female Ladies of London;" "The three C's—Cox, King, and Curtis;" and "The three R's—Reading, Writing, and Rithmetic."

It has been very much the fashion amongst a class of persons to attribute to Sir W. C. ... a vulgarity and ignorance of speech which are by no means consistent with his character and conduct. The worthy and hospitable baronet has a rapid mode of speech, but it is always correct ; and although some eccentricities are mixed up in his composition, he is highly honourable, and has been a very useful member of society, particularly to his London constituents. [The Mirror, Jan. 29, 1825]

After listing some examples, the article continues:

It is, however, very certain, that at a city festival some years ago, having indulged very freely, he fell asleep, when some wag, choosing to consider him dead, wrote his epitaph, which was found next morning pinned to the baronet's dress coat:—
"Here lies the great Curtis,
Of London, Lord May'r:
He's left this here world,
And gone to that there."
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male chauvinist (adj.)

by 1936; popular from 1969 (with added pig (n.) by 1970); a specialized use of chauvinism, which in late 19c. international Communist Party jargon was extended to racism and in the next generation to sexism:

In this era, inspired by the CP's struggle against racism, women in the CP coined the term male chauvinism, in a parallel with white chauvinism, to derogate the conviction of men that they were better than women. [Jane Mansbridge and Katherine Flaster, "Male Chauvinist, Feminist, and Sexual Harassment, Different Trajectories in Feminist Linguistic Innovation," "American Speech," vol. lxxx, no. 3, Fall 2005]

Related: Male-chauvinism (1969).

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red herring (n.)

"smoked herring" early 15c. (they turn red when cured), as opposed to white herring "fresh herring." Supposedly used by fugitives to put bloodhounds off their scent (1680s), hence metaphoric sense (1864) of "something used to divert attention from the basic issue;" earlier it simply meant "a false lead":

Though I have not the honour of being one of those sagacious country gentlemen, who have so long vociferated for the American war, who have so long run on the red-herring scent of American taxation before they found out there was no game on foot; (etc.) [Parliamentary speech dated March 20, 1782, reprinted in "Beauties of the British Senate," London, 1786]
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