Etymology
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shoot-out (n.)
1953; expression shoot it out is from 1912; see shoot (v.) + out (adv.).
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brown-out (n.)
"partial blackout," 1942, based on blackout in the "dousing of lights as an air raid precaution" sense; from brown (adj.) as "not quite black."
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put-out (adj.)

"offended, angry, upset," by 1887, from the verbal phrase in the sense of "offend," attested by 1822; see put (v.) + out (adv.). Perhaps via the earlier sense of "cause to lose self-possession, disconcert" (1580s). The verbal phrase is from mid-14c. as "drive out, banish, exile;" from 1520s as "extinguish" (a fire or burning object). To put out, of a woman, "to offer oneself for sex" is attested by 1947.

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pass out (v.)

"lose consciousness," 1915, from pass (v.) + out. Probably a weakened sense from earlier meaning "to die" (1899). Meaning "to distribute" is attested from 1926. Related: Passed out.

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stand-out (n.)
also standout, "one who is eminent," 1928; as an adjective in this sense from 1932; from verbal phrase, from stand (v.) + out (adv.). Earlier it was used in a sense "labor strike" (1898). To stand out is from 1530s as "to project or seem to project," 1826 in the figurative sense "be prominent."
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walk-out (n.)
"strike," 1888, from walk (v.) + out (adv.). Phrase walk out "to leave" is attested by 1840. To walk out on a person "desert, forsake" is by 1913.
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white-out (n.)
1946 as an extreme snow condition on the U.S. prairie, from white as a verb + out (adv.). From 1977 as a liquid correction for paper.
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buy-out (n.)
also buy-out, "the purchasing of a controlling share in a company," 1961, from verbal phrase buy out "purchase (someone's) estate and turn him out of it," 1640s, from buy (v.) + out (adv.).
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rain-out (n.)

also rain out, rainout, "cancellation or interruption of an outdoor event due to rain," 1947, from the verbal phrase; see rain (v.) + out (adv.). Of baseball games, to be rained out "cancelled because of rain" is attested from 1928.

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wash-out (n.)
also washout, 1877, "act of washing out" (a drain, etc.), from verbal phrase; see wash (v.) + out (adv.). From 1873 as "excavation of a roadbed, etc., by erosion" is from 1873. Meaning "a disappointing failure" is from 1902, from verbal phrase wash out "obliterate, cancel" (something written in ink), attested from 1570s. Hence also the colloquial sense of "to call off (an event) due to bad weather, etc." (1917). Of colored material, washed-out "faded" is from 1837.
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