Word Origin & History

"fly up suddenly," c.1300, perhaps imitative of the sound of beating wings, or related to flash via its variant flushe. Probably not connected to O.Fr. flux, source of flush (n.). Transitive meaning "to cause to fly, start" is first attested mid-15c. The sense of "spurt, rush
out suddenly, flow with force" (1540s) is probably the same word, with the connecting notion being "sudden movement," but its senses seem more to fit the older ones of flash (now all transferred to this word except in flash flood). The noun sense of "sudden redness in the face" (1620s) probably belongs here, too. "A very puzzling word" [Weekley]. Related: Flushed flushing.

"even, level," c.1550, perhaps from flush (v.) through the notion of a river running full, hence level with its banks. Applied to money since at least c.1600.

"hand of cards all of one suit," 1529, perhaps from M.Fr. flus (15c.), from O.Fr. flux "a flowing," with the sense of "a run" (of cards), from L. fluxus "flux," from fluere "to flow" (see fluent). The form in Eng. probably was influenced by flush (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

flush 1 (flŭsh)
v. flushed, flush·ing, flush·es

  1. To turn red, as from fever, heat, or strong emotion; blush.

  2. To clean, rinse, or empty with a rapid flow of a liquid, especially water.

  1. An act of cleansing or rinsing with a flow of water.

  2. A reddening of the skin, as with fever, emotion, or exertion.

  3. A brief sensation of heat over all or part of the body.

Having surfaces in the same plane; even.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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