wince

(noun) the facial expression of sudden pain.

(noun) a reflex response to sudden pain. Synonyms: flinch.

(verb) draw back, as with fear or pain. Synonyms: flinch, squinch, funk, cringe, shrink, recoil, quail. Example: "She flinched when they showed the slaughtering of the calf."

(verb) make a face indicating disgust or dislike. Example: "She winced when she heard his pompous speech."