Definition of "grimace"
noun:
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A distortion of the countenance, whether habitual, from affectation, or momentary and occasional, to express some feeling, as contempt, disapprobation, complacency, etc.; a smirk; a made-up face.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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verb:
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To make grimaces; to distort one's face; to make faces.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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