wince

nouns

the facial expression of sudden pain
is a type of (narrower)
a gesture executed with the facial muscles
a reflex response to sudden pain

verbs

draw back, as with fear or pain
"she flinched when they showed the slaughtering of the calf"
make a face indicating disgust or dislike
"She winced when she heard his pompous speech"
is a type of (narrower)
contort the face to indicate a certain mental or emotional state
"He grimaced when he saw the amount of homework he had to do"