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 persecuted me, He hath gnashed upon me with his teeth, Mine adversary, hath sharpened his eyes for me.
The lawless one, shall see, and be indignant, his teeth, will he gnash and melt away, The craving of the lawless, shall vanish.
All thy foes, have opened wide, over thee their mouth, They have hissed, and gnashed their teeth, They have said - We have swallowed her up! Surely, this, is the day for which we have waited, We have found! We have seen!
and, wheresoever it seizeth him, it teareth him, and he foameth, and grindeth his teeth, and weareth himself out; - and I spake to thy disciples, that they should cast it out, and they could not.
And, while they were hearing these things, they were being pierced in their hearts, and began gnashing their teeth against him.