Definition of “rash” - English Dictionary

“rash” in British English

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rashnoun

uk /ræʃ/ us /ræʃ/

rash noun (SKIN CONDITION)

C2 [ C or U ] a lot of small red spots on the skin:

I've got an itchy rash all over my chest.
If you stay in the sun too long you'll get (a) heat rash.
UK He came out/up in a rash after he fell in a patch of nettles.

rashadjective

uk /ræʃ/ us /ræʃ/
rashly
adverb uk /ˈræʃ.li/ us /ˈræʃ.li/

They were afraid he might act rashly and hurt somebody.
rashness
noun [ U ] uk /ˈræʃ.nəs/ us /ˈræʃ.nəs/

In a moment of rashness, I agreed to go skydiving for charity.

(Definition of “rash” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“rash” in American English

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rashadjective

us /ræʃ/

rash adjective (WITHOUT THOUGHT)

without thought for what might happen or result; unwise in your actions:

a rash statement
It was rash of them to get married so quickly.

rashnoun

us /ræʃ/

rash noun (SKIN CONDITION)

[ C ] a group of spots or a raised area on the skin resulting from illness or from touching a harmful substance:

an itchy rash

rash noun (LARGE NUMBER)

[ C usually sing ] a large number, esp. of something happening in a short period of time:

There’s been a rash of robberies in the valley.

(Definition of “rash” from the Cambridge Academic Content Dictionary © Cambridge University Press)