definition of
clack

[1] #1 clack n. [clap] a sharp abrupt noise as if two objects hit together; may be repeated. wn

[2] #2 clack v. [clatter, brattle] make a rattling sound; "clattering dishes". wn

[3] #3 clack n. [clack valve, clapper valve] a simple valve with a hinge on one side; allows fluid to flow in only one direction. wn

[4] #4 clack v. [cluck, click] make a clucking sounds, characteristic of hens. wn

[5] #5 clack v. [chatter, piffle, palaver, prate, tittle-tattle, twaddle, maunder, prattle, blab, gibber, tattle, blabber, gabble] speak (about unimportant matters) rapidly and incessantly. wn