Gnash
Gnash (חָרִק charak, to grate the teeth; βρύχω, Ac 7:54; τρίξω, Mr 9:18). "To gnash with the teeth," and "gnashing of teeth," are expressions that occur in several parts of Scripture, denoting rage or sorrow (Job 16:9; Ps 112:10; La 2:16; Mt 8:12). SEE TOOTH.