Dictionary definition · clack
noun
- a sharp abrupt noise as if two objects hit together; may be repeated
- a simple valve with a hinge on one side; allows fluid to flow in only one direction
verb
- make a rattling sound"clattering dishes"
- make a clucking sounds, characteristic of hens
- speak (about unimportant matters) rapidly and incessantly
Source: Open English WordNet (CC BY 4.0).