clack

Short definition from Wiktionary

Noun

1. 1
   An abrupt, sharp sound, especially one made by two hard objects colliding repetitively; a sound midway between a click and a clunk.
2. 2
   Anything that causes a clacking noise, such as the clapper of a mill, or a clack valve.
3. 3
   Chatter; prattle.
4. 4
   The tongue.

Verb

1. 1
   To make a sudden, sharp noise, or succession of noises; to click.
2. 2
   To cause to make a sudden, sharp noise, or succession of noises; to click.
3. 3
   To chatter or babble; to utter rapidly without consideration.
4. 4
   To cut the sheep's mark off (wool), to make the wool weigh less and thus yield less duty.
5. 5
   Dated form of cluck.

Proper noun

1. 1
   A surname.