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.)
His anger tears me in his persistent resentment against me; he gnashes his teeth at me. My adversary glares at me.
The wicked person sees this and flies into a rage; his teeth gnash and wear away. The desire of the wicked will amount to nothing.
All of your enemies insult you with gaping mouths. They hiss and grind their teeth while saying, "We have devoured her completely. Yes, this is the day that we anticipated! We found it at last; we have seen it!"
Whenever it brings on a seizure, it throws him to the ground. Then he foams at the mouth, grinds his teeth, and becomes stiff. So I asked your disciples to drive the spirit out, but they didn't have the power."
While they were listening to these things, they became more and more furious and began to grind their teeth at him.
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