Verb for facial expression (lips)
Hi all!
I'm looking for a very particular verb describing a facial expression where one side of the upper lip is moved up to the side? I've read the definition somewhere but forgot the verb in question.

Question

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To smirk (I smirk, I am smirking, He smirks, I smirked, I will smirk)

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Jerry thank you very much for this precision! I think it is indeed "sneer" I was looking for judging from the picture on google.

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Sneer or smirk

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Could also be sneer depending on what the context is.