clack - noun

a sharp abrupt noise as if two objects hit together; may be repeated

a simple valve with a hinge on one side; allows fluid to flow in only one direction

clack - verb

• make a rattling sound
• make a clucking sounds, characteristic of hens
• speak (about unimportant matters) rapidly and incessantly

clack - thesaurus

blab   blabber   brattle   chatter   clap   clatter   click   cluck   gabble   gibber   maunder   palaver   piffle   prate   prattle   tattle   twaddle