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 (grĭm′ĭs, grĭ-mās′)
A sharp contortion of the face expressive of pain, contempt, or disgust.
intr.v. grim·aced, grim·ac·ing, grim·ac·es
To make a sharp contortion of the face.

[French, from Old French grimache, alteration of grimuche, probably from Frankish *grīma, mask.]

grim′ac·er n.
References in classic literature ?
Lenepveu's copper ceiling, figures grinned and grimaced, laughed and jeered at MM.
The French officers grimaced and smiled in exceedingly high spirits, wonderfully pleased with the discreet manner in which these distinguished personages behaved themselves.
In fact, it was their regular programme, each trip, to paddle out and around the Makambo and make ferocious grimaces up at Kwaque, who grimaced back at them from over the rail.
The leading nigger had armed himself with a cleaver from the galley, and he grimaced like an ape as he prepared to slice me down.
A death's head grimaced as though a man long dead raised his parchment-covered skull from an old grave.
I told you they was all thumbs," he grimaced, holding up his hand and squinting at it with the fraction of sight remaining to him.
The Duke and Duchess of Cambridge grimaced as English boxer Scott Fitzgerald exchanged blows with Ghana's Azumah Mohammed.
A small trail at the University of Chicago Comer Children's Hospital found that warmer infants cried and grimaced less than babies given sugar pills or a dummy before vaccination.
TORREY seems to be the hardest word for Tiger Woods, who grimaced through the third round of the US Open at Torrey Pines early today - amid whispers that he won't be fit for the Open at Royal Birkdale next month.
Some of Britto's most enthusiastic subjects were a group of teens in Philadelphia: Andrew Jenkins, 14, staggered toward a friend as they grimaced, rolled their eyes, and held a crooked wrist at shoulder level.