Reference: Gnash
Easton
Heb harak, meaning "to grate the teeth", (Job 16:9; Ps 112:10; La 2:16), denotes rage or sorrow. (See also Ac 7:54; Mr 9:18.)
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His anger has torn me and persecuted me; he has gnashed at me with his teeth; my adversary locks his eyes on me.
When the wicked see this, they will worry; they will grind their teeth in frustration and melt away; the desire of the wicked will perish.
(Pe) All your enemies gloated over you. They sneered and gnashed their teeth; they said, "We have destroyed her! Ha! We have waited a long time for this day. We have lived to see it!"
Whenever it seizes him, it throws him down, and he foams at the mouth, grinds his teeth, and becomes rigid. I asked your disciples to cast it out, but they were not able to do so."
When they heard these things, they became furious and ground their teeth at him.