Definition of not turn a hair
- Most people would have been very nervous in that situation, but she never turned a hair.
: to cause to move around an axis or a center : make rotate or revolve
: to cause to move around so as to effect a desired end (as of locking, opening, or shutting)
: to affect or alter the functioning of (something, such as a mechanical device) or the level of (something, such as sound) by such movement
: the action or an act of turning about a center or axis : revolution, rotation
: any of various rotating or pivoting movements in dancing or gymnastics
: the action or an act of giving or taking a different direction : change of course or posture : such as
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