turn a hair, not(redirected from turn a hair)
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not turn a hair
To show no outward emotion when something bad happens or is announced. I thought he'd be devastated after losing the race, but he didn't turn a hair. You have to give Jane credit: she didn't turn a hair when the customer started shouting in her face.
turn a hair, not
Not become afraid or upset, remain calm, as in She didn't turn a hair during the bank robbery. This term, also put as without turning a hair, comes from horse racing. After a race, a horse often has roughened, outward-turned hair. Its figurative use, nearly always in the negative, dates from the late 1800s.