From Longman Dictionary of Contemporary Englishrashrash1 /ræʃ/ adjective CARELESSif you are rash, you do things too quickly, without thinking carefully about whether they are sensible or not → foolish Please Jessie, don’t do anything rash. Don’t go making any rash decisions about your future! It was rather rash of you to lend them your car. —rashly adverb I rashly agreed to look after the children. —rashness noun [uncountable]
Examples from the Corpus
rash• At times like this the only sensible thing to do is something rash.• But while the plans are grand, they are not necessarily rash.• Fortunately, there is nothing dogmatic or rash about Jospin.• The rash application of strong antiseptic solutions to prevent or ward off infection is another rare cause of urethritis.• a rash decision• Disputes were resolved by rash games of gambling and false threats rather than by combat.• Stay where you are and don't do anything rash -- I'll be over in five minutes.• Don't make any rash promises that you may regret later.• It would be rash to put too much into stocks right now.rash decisions• Before making any rash decisions about your fund you should consider the following points.rashrash2 noun [countable] 1 MIa lot of red spots on someone’s skin, caused by an illness She had a nasty rash on her arm.come/break out in a rash (=get a rash) My mother comes out in a rash if she eats seafood.nappy rash British English, diaper rash American English Most babies get nappy rash at some stage. a heat rash (=a rash caused by heat)2 → rash of somethingExamples from the Corpus
rash• Symptoms include high fever and a rash.• In the past two months there has been a rash of newspaper advertisements for unlicensed patches available by mail order.• It's good for cysts, rashes, fevers, infections, parasites, skin problems and regrowth of fins.• It made little difference if a dreadful rash despoiled both little faces.• In comparison studies, babies wearing them seem to have rash less often and less severely.• One of his powders was good for heat rash.• Lillian did not go for the powwow treatment; her rash subsided without help from either science or witchcraft.• The side effects of this drug include gastrointestinal uPset and skin rash.• He was puzzled at first; his skin was generally clear, without rashes.come/break out in a rash• Alan broke out in a rash once, and Marc threw up after one meal.• Tell them you've come out in a rash, or something.Origin rash1 (1300-1400) Probably from an unrecorded Old English ræsc rash2 (1700-1800) Early French rache “small pieces of loose skin”, from Latin radere; → RAZE 