not turn a hair

idiom

Definition of not turn a hair

informal
: to remain calm even though something frightening or shocking has happened Most people would have been very nervous in that situation, but she never turned a hair.

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“Not turn a hair.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/not%20turn%20a%20hair. Accessed 5 Aug. 2020.

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