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 hath torn, and he hateth me, He hath gnashed at me with his teeth, My adversary sharpeneth his eyes for me.
The wicked seeth, and hath been angry, His teeth he gnasheth, and hath melted, The desire of the wicked doth perish!
Opened against thee their mouth have all thine enemies, They have hissed, yea, they gnash the teeth, They have said: 'We have swallowed her up, Surely this is the day that we looked for, We have found -- we have seen.'
and wherever it doth seize him, it doth tear him, and he foameth, and gnasheth his teeth, and pineth away; and I spake to thy disciples that they may cast it out, and they were not able.'
And hearing these things, they were cut to the hearts, and did gnash the teeth at him;