Definition of “not turn a hair” - English Dictionary

british dictionary

“not turn a hair” in British English

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not turn a hair

to not show any emotion when you are told something bad or when something bad happens:

I was expecting him to be horrified when he heard the cost but he didn't turn a hair.

(Definition of “not turn a hair” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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