grate the teeth

. to bite or eat greedily , with the teeth: .† to gnash, grind Ac 7:54

knersten

I grind or gnash, as with the teeth for rage or pain.

to gnash

to grate the teeth (in pain or rage)

gnash

βρύχω (Attic, βρύκω), [in LXX: Job.16:10(9), Psa.34 (35):16 36 (37):12 111 (112):10, La 2:16 (חרק)* ;] 1. to bite or eat greedily. 2. to gnash, grind, with the teeth: Act.7:54. † (AS)