grimace

US /ˈɡrɪm.əs/
UK /ˈɡrɪm.əs/
"grimace" picture
1.

an ugly, twisted expression on a person's face, typically expressing disgust, pain, or wry amusement

:
He made a grimace of pain when he twisted his ankle.
Her smile was more of a grimace than genuine amusement.
1.

make a grimace

:
He grimaced at the bitter taste of the medicine.
She grimaced as the dentist began the procedure.