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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He has torn me in his wrath, and persecuted me. He has gnashed upon me with his teeth. My adversary sharpens his eyes upon me.
A wicked man shall see it, and be grieved. He shall gnash with his teeth, and melt away. The desire of wicked men shall perish.
All thine enemies have opened their mouth wide against thee. They hiss and gnash the teeth. They say, We have swallowed her up. Certainly this is the day that we looked for. We have found, we have seen it.
And wherever it seizes him, it tears him, and he foams, and gnashes his teeth, and becomes limp. And I spoke to thy disciples that they might cast it out, and they were not able.
Now when they heard these things, they were split with a saw in their hearts, and they gnashed their teeth against him.