To make a sudden, sharp noise, or a succesion of such noises, as by striking an object, or by collision of parts; to rattle; to click.
- To make an abrupt, sharp sound, as in the collision of two hard surfaces.
- To chatter thoughtlessly or at length.
- To cackle or cluck, as a hen.
- To cause to make an abrupt, sharp sound.
- A clacking sound: the clack of an old-fashioned typewriter.
- Something that makes a clacking sound.
- Thoughtless, prolonged talk; chatter.