clack /klak/

1. To make a noise as of a hard, flat thing flapping
2. To chatter
3. To cackle

1. A noise of this kind
2. An instrument making it
3. The sound of chattering voices
4. The tongue (informal)

clackˈer noun

clackˈbox noun

The box containing the clack valve of an engine

clackˈdish noun (archaic)

A wooden dish carried by beggars, having a movable cover which they clacked to attract attention

clack valve noun

A valve consisting of a hinged flap or other device that falls back with a clacking noise

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