Search Result for "gnash": 
Wordnet 3.0

VERB (1)

1. grind together, of teeth;


The Collaborative International Dictionary of English v.0.48:

Gnash \Gnash\, v. i. To grind or strike the teeth together. [1913 Webster] There they him laid, Gnashing for anguish, and despite, and shame. --Milton. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Gnash \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. [1913 Webster]
WordNet (r) 3.0 (2006):

gnash v 1: grind together, of teeth
Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "gnash": bite, bolus, champ, chaw, chew, chew the cud, chew up, chomp, cud, gnaw, gob, grind, gum, masticate, morsel, mouth, mouthful, mumble, munch, nibble, nip, quid, ruminate, snap, swallow
Easton's 1897 Bible Dictionary:

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.)