An abrupt, sharp sound, especially one made by two hard objects colliding repetitively; a sound midway between a click and a clunk.

Anything that causes a clacking noise, such as the clapper of a mill, or a clack valve.

Chatter; prattle.

To make a sudden, sharp noise, or succession of noises; to click.

To cause to make a sudden, sharp noise, or succession of noises; to click.

To chatter or babble; to utter rapidly without consideration.