Etymology
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white trash (n.)

1824, originally in African-American vernacular in the South.

The slaves themselves entertain the very highest contempt for white servants, whom they designate as 'poor white trash.' [Fanny Kemble, journal, Jan. 6, 1833]
[T]he term [poor white] is rather loosely applied by Northern writers even to mountaineers and to small farmers who live on a precarious footing. But in the Southern conception, not everyone who is both poor and white is a "poor white." To the Southerner, the "poor white" in the strictest sense is a being beyond the pale of even the most generous democratic recognition; in the negro's term, "po' white trash," or so much social débris. [Robert Penn Warren, "The Briar Patch," 1930, footnote]
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white noise (n.)
"sound made up of a random mixture of frequencies and intensities," by 1970, from white (adj.) + noise (n.).
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lily-white (adj.)
early 14c., from lily + white (adj.); from 1903 with reference to whites-only segregation; 1961 as "irreproachable."
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white meat (n.)
"meat of poultry, pigs, etc.," as opposed to red meat, 1752, from white (adj.) + meat (n.). Earlier it meant "foods prepared from milk" (early 15c.). African-American vernacular sense of "white women as sex partners" is from 1920s.
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white hope (n.)

"person or thing that people hope will be very successful in the near future," 1911, originally in U.S. sporting use in reference to the quest for a white man capable of beating champion pugilist Jack Johnson.

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white elephant (n.)
"burdensome charge, inconvenient thing that one does not know how to get rid of," 1851, supposedly from the practice of the King of Siam of presenting one of the sacred albino elephants to a courtier who had fallen from favor; the gift was a great honor, but the proper upkeep of one was ruinously expensive.
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white-tail (n.)
type of North American deer, 1872, from white (adj.) + tail (n.).
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white-hot (adj.)
"heated to full incandescence," 1820, from white (adj.) + hot (adj.). White heat is from 1710; figurative sense of "state of intense or extreme emotion" first recorded 1839.
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white-collar (adj.)

by 1911, perhaps 1909, from white (adj.) + collar (n.).

The white collar men are your clerks; they are your bookkeepers, your cashiers, your office men. We call them the 'white collar men' in order to distinguish them from the men who work with uniform and overalls and carry the dinner pails. The boys over on the West side got that name for them. It was supposed to be something a little better than they were. [Malcolm McDowell, quoted in Chicago Commerce, June 12, 1914]

White-collar crime attested by 1957 (there is a white-collar criminaloids from 1934).

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egg-white (n.)

"the clear liquid contained within an egg," 1881, from egg (n.) + white (n.). Also known as albumen or glair.

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