turn a hair, not

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not turn a hair

To show no outward emotion when something bad happens or is announced; to maintain a perfectly calm demeanor. 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. The woman, not turning a hair, paid nearly $30 grand in cash for the diamond-encrusted necklace.
See also: hair, not, turn
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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.
See also: not, turn
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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