"grimace" in the noun sense
1. grimace, face
a contorted facial expression
"she made a grimace at the prospect"
"grimace" in the verb sense
1. grimace, make a face, pull a face
contort the face to indicate a certain mental or emotional state
"He grimaced when he saw the amount of homework he had to do"
Source: WordNet® (An amazing lexical database of English)
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