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 rent in his anger, and he will lie in wait for me, gnashing upon me with his teeth; mine enemy will sharpen his eyes against me.
The unjust one shall see and be angry; shall gnash his teeth and he melted away: the desire of the unjust shall perish.
All thine enemies opened wide their mouth upon thee: they hissed and they will gnash the teeth: they said, We swallowed down: surely this the day we longed for; we found; we saw.
And wherever he overtakes him, he rends him: and he foams, and gnashes his teeth, and he is dried up: and I spake to thy disciples that they might cast him out; and they could not.
And having heard those, they were sawn through their hearts, and they gnashed the teeth upon him.