Answer: gnashes

AnswerCrossword Clue
GNASHESGrinds, as teeth
GNASHESGrinds, as gears
GNASHESGrinds in anger, maybe
GNASHESGrinds together, as teeth
GNASHESGrinds the teeth.
GNASHESGrits the teeth.
GNASHESGrinds together.
GNASHESGrinds the teeth together.
GNASHESGrinds one's teeth.
GNASHESGrinds one's teeth
GNASHESGrinds
gnashesto grind (the teeth) together, as in rage
gnashesGNASH, to grind the teeth together