curl (one's) lip(redirected from curl their lips)
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curl (one's) lip
To sneer at something. When I heard what was for dinner, I curled my lip in disgust. Don't you curl your lip at me! I did nothing wrong here!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
curl your lipraise a corner of your upper lip to show contempt; sneer.
Farlex Partner Idioms Dictionary © Farlex 2017