rash [ræʃ]

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adj.轻率的；n.（皮）疹，爆发的一连串

a lot of small red spots on the skin

My skin has broken out in an itchy rash. 我的皮肤上突然长出一片让人发痒的皮疹。
Don't be rash in making your decision. 别轻率做出决定。