Clack

v. i. [imp. & p. p. CLACKED (klăkt); p. pr. & vb. n. CLACKING.] [Fr. claquer, to clap, crack, D. klakken, to clap, Ir. clagaim, I make a noise, ring. See infra.] 1. To make a sudden, sharp noise, as by striking or cracking; to clink; to click. We heard Mr. Hodson's whip clacking on the shoulders of the poor little wretches. Thackeray. 2. To utter words rapidly and continually, or with sharp, abrupt sounds; to let the tongue run.

v. t. 1. To cause to make a sudden, sharp noise; to clink. 2. To utter rapidly and inconsiderately. Feltham. To clack wool, to cut off the sheep’s mark, which makes it weigh less and yield less duty. [Eng.]