Etymology
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broom (n.)

Old English brom, popular name for several types of shrubs common throughout Europe (used medicinally and for fuel) and characterized by long, slender branches and many yellow flowers, from Proto-Germanic *bræmaz "thorny bush" (source also of Dutch braam, German Brombeere "blackberry"), from PIE *bh(e)rem- "to project; a point."

As "twigs of broom tied together to a handle to make a tool for sweeping," mid-14c. Traditionally, both the flowers and sweeping with broom twigs were considered unlucky in May (Suffolk, Sussex, Wiltshire, etc.).

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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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white bread (n.)

c. 1300, as opposed to darker whole-grain type, from white (adj.) + bread (n.). Its popularity among middle-class America led to the slang adjectival sense of "conventional, bourgeois" (c. 1980). Old English had hwitehlaf.

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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 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 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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