Easton’s 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.)

Easton’s Bible Dictionary, M. G. Easton (1897). Public domain, from the CrossWire SWORD module.