Word Origin & History
rashc.1300, "nimble, quick, vigorous," a Scottish and northern word, perhaps from O.E. -ræsc (cf. ligræsc "flash of lightning"), from P.Gmc. *raskuz (cf. M.L.G. rasch, M.Du. rasc "quick, swift," Ger. rasch "quick, fast"). Related to O.E. horsc "quick-witted." Sense of "reckless, impetuous, heedless
of consequences" is attested from 1509.
rash"red spots on skin," 1709, perhaps from Fr. rache "a sore," from O.Fr. rache "ringworm," from V.L. *rasicare "to scrape" (cf. O.Prov. rascar, Sp. rascar "to scrape, scratch," It. raschina "itch"), from L. rasus "scraped," pp. of radere "to scrape" (see
raze). The connecting
notion is of itching. Sense of "any sudden outbreak or proliferation" first recorded 1820.
rasher"thin slice of bacon or ham," 1592, of unknown origin. Perhaps from M.E. rash "to cut," var. of rase "to rub, scrape out, erase," from O.Fr. raser (see
raze). However, early lexicographer John Minsheu explained it in 1627 as a piece "rashly or hastily roasted."