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The Collaborative International Dictionary of English v.0.48 (gcide)

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]


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]