Meaning of “hit/touch a (raw) nerve” in the English Dictionary

English

"hit/touch a (raw) nerve" in English

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hit/touch a (raw) nerve

C2 to upset someone:

She touched a raw nerve when she mentioned that job he didn't get.

(Definition of “hit/touch a (raw) nerve” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)