Gnash

(năsh), v. t. [imp. & p. p. GNASHED (năsht); p. pr. & vb. n. GNASHING.] [O. Eng. gnaste, gnayste, Dan. knase, knaske, Icel. gnista, Sw. knastra, gnissla, D. knarsen, knersen, L. Ger. gnirschen, H. Ger. knirschen.] To strike together, as in anger or pain; as, to gnash the teeth.