Definitions from Wiktionary (clack)

▸ noun:  An abrupt, sharp sound, especially one made by two hard objects colliding repetitively; a sound midway between a click and a clunk.
▸ noun:  Anything that causes a clacking noise, such as the clapper of a mill, or a clack valve.
▸ noun:  Chatter; prattle.
▸ noun:  (colloquial) The tongue.
▸ verb:  (intransitive) To make a sudden, sharp noise, or succession of noises; to click.
▸ verb:  (transitive) To cause to make a sudden, sharp noise, or succession of noises; to click.
▸ verb:  To chatter or babble; to utter rapidly without consideration.
▸ verb:  (UK) To cut the sheep's mark off (wool), to make the wool weigh less and thus yield less duty.
▸ noun:  A surname.
▸ verb:  Dated form of cluck. [(intransitive) To make low clicking sounds (refers to hens).]

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