[rash] /ræʃ/

adjective, rasher, rashest.
acting or tending to act too hastily or without due consideration.
characterized by or showing too great haste or lack of consideration:
rash promises.
acting without due consideration or thought; impetuous
characterized by or resulting from excessive haste or impetuosity: a rash word
(pathol) any skin eruption
a series of unpleasant and unexpected occurrences: a rash of forest fires

late 14c., “nimble, quick, vigorous” (early 14c. as a surname), a Scottish and northern word, perhaps from Old English -ræsc (cf. ligræsc “flash of lightning”) or one of its Germanic cognates, from Proto-Germanic *raskuz (cf. Middle Low German rasch, Middle Dutch rasc “quick, swift,” German rasch “quick, fast”). Related to Old English horsc “quick-witted.” Sense of “reckless, impetuous, heedless of consequences” is attested from c.1500. Related: Rashly; rashness.

“eruption of small red spots on skin,” 1709, perhaps from French rache “a sore” (Old French rasche “rash, scurf”), from Vulgar Latin *rasicare “to scrape” (also source of Old Provençal rascar, Spanish rascar “to scrape, scratch,” Italian raschina “itch”), from Latin rasus “scraped,” past participle of radere “to scrape” (see raze). The connecting notion would be of itching. Figurative sense of “any sudden outbreak or proliferation” first recorded 1820.

rash (rāsh)
A skin eruption.


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