clack

(noun) a sharp abrupt noise as if two objects hit together; may be repeated. Synonyms: clap.

(noun) a simple valve with a hinge on one side; allows fluid to flow in only one direction. Synonyms: clack valve, clapper valve.

(verb) make a rattling sound. Synonyms: clatter, brattle. Example: "Clattering dishes."

(verb) make a clucking sounds, characteristic of hens. Synonyms: cluck, click.

(verb) speak (about unimportant matters) rapidly and incessantly. Synonyms: chatter, piffle, palaver, prate, tittle-tattle, twaddle, maunder, prattle, blab, gibber, tattle, blabber, gabble.