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 teareth and pursueth me; he gnasheth with his teeth against me; as mine adversary he sharpeneth his eyes at me.
The wicked man shall see it and be vexed; he shall gnash with his teeth, and melt away: the desire of the wicked shall perish.
All thine enemies open their mouth against thee, they hiss and gnash the teeth: they say, We have swallowed her up; this is forsooth the day that we looked for: we have found, we have seen it.
and wheresoever it seizes him it tears him, and he foams and gnashes his teeth, and he is withering away. And I spoke to thy disciples, that they might cast him out, and they could not.
And hearing these things they were cut to the heart, and gnashed their teeth against him.