Gnashing

[nash] /næʃ/

verb (used with object)
1.
to grind or strike (the teeth) together, especially in rage or pain.
2.
to bite with grinding teeth.
verb (used without object)
3.
to gnash the teeth.
noun
4.
an act of gnashing.
/næʃ/
verb
1.
to grind (the teeth) together, as in pain or anger
2.
(transitive) to bite or chew as by grinding the teeth
noun
3.
the act of gnashing the teeth
v.

early 15c., variant of Middle English gnasten “to gnash the teeth” (c.1300), perhaps from Old Norse gnastan “a gnashing,” of unknown origin, probably imitative. Cf. German knistern “to crackle.” Related: Gnashed; gnashing.

Heb. harak, meaning “to grate the teeth”, (Job 16:9; Ps. 112:10; Lam. 2:16), denotes rage or sorrow. (See also Acts 7:54; Mark 9:18.)

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