Grimace

Part of speech: noun (n.)

A distortion of the countenance, whether habitual, from affectation, or momentary aad occasional, to express some feeling, as contempt, disapprobation, complacency, etc.; a smirk; a made-up face. Moving his face into such a hideons grimace, that every feature of it appeared under a different distortion. Addison.

Part of speech: verb (v.)

To make grimaces; to distort one's face; to make faces. H. Martineau.