| clack | (noun) a simple valve with a hinge on one side; allows fluid to flow in only one direction | Synonyms: clack valve, clapper valve |
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| (noun) a sharp abrupt noise as if two objects hit together; may be repeated | Synonyms: clap |
| (verb) speak (about unimportant matters) rapidly and incessantly | Synonyms: blab, blabber, chatter, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle |
| (verb) make a clucking sounds, characteristic of hens | Synonyms: click, cluck |
| (verb) make a rattling sound | Synonyms: brattle, clatter |