noun

rash

rash, eruption, hasty, reckless

He has a nasty rash on his arm.

He has a nasty rash on his arm.

It was a rash decision to quit your job.

It was a rash decision to quit your job.

a/an ((...)) rash (noun) an area of red spots on the skin. He has a nasty rash on his arm.

a/an rash ((noun)) (adjective) done too quickly without thinking. It was a rash decision.

Noun: eruption, breakout; Adjective: hasty, reckless, impulsive; Antonyms (adj): cautious, careful

Two separate origins. Noun (skin): unknown. Adjective (hasty): from a Germanic root meaning 'quick, swift'. The two are unrelated.

Link the two meanings: you might get a skin 'rash' (noun) from making a 'rash' (adjective) decision to run through poison ivy.

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