GNASH

Gnash. Gnash
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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gnash. Gnash, v. to grind the teeth in a rage, to clash

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Gnash (?), v. t. [imp. & p. p. Gnashed (#); p. pr. & vb. n. Gnashing.] [[OE. gnasten, gnaisten, cf. Icel. gnastan a gnashing, gn�sta to gnash, Dan. knaske, Sw. gnissla, D. knarsen, G. knirschen.]] To strike together, as in anger or pain; as, to gnash the teeth.