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English definition of “not turn a hair”

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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.
Translations of “not turn a hair”
in Chinese (Traditional) 面不改容,保持鎮靜…
in Chinese (Simplified) 面不改色,保持镇静…
(Definition of not turn a hair from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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