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.).

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.

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.

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]

"sound made up of a random mixture of frequencies and intensities," by 1970, from white (adj.) + noise (n.).

early 14c., from lily + white (adj.); from 1903 with reference to whites-only segregation; 1961 as "irreproachable."

"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.

"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.