Hypertext Webster Gateway: "Gnashed"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
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