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.)