GNASHES

Verb

gnashes

Third-person singular simple present indicative form of gnash

Source: Wiktionary

GNASH

Gnash, v. t. [imp. & p. p. Gnashed; p. pr. & vb. n. Gnashing.] Etym: [OE. gnasten, gnaisten, cf. Icel. gnastan a gnashing, gn to gnash, Dan.knaske, Sw. gnissla, D. knarsen, G. knirschen.]

Definition: To strike together, as in anger or pain; as, to gnash the teeth.

Gnash, v. i.

Definition: To grind or strike the teeth together. There they him laid, Gnashing for anguish, and despite, and shame. Milton.

Source: Webster’s Unabridged Dictionary 1913 Edition