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 hunted me down. He has gnashed at me with his teeth. My adversary glares at me.
The wicked sees this and becomes angry. He angrily grits his teeth and disappears. The hope of the wicked will perish (be destroyed).
All your enemies are opening their mouths wide against you. They hiss and whistle through their teeth and say: We have made a meal of her. Certainly this is the day we have been looking for. It has come and we see it.
The spirit seizes him and slams him down. He foams at the mouth and grinds his teeth. I asked your disciples to cast it out but they could not do it.
When they heard these things, they were cut to the heart. They gnashed their teeth at him.