1. (noun) clack, clap
a sharp abrupt noise as if two objects hit together; may be repeated
Synonyms: clapper valve, clack valve, clack, clap, bang, blast, gonorrhea, bam, eruption, gonorrhoea
2. (verb) clack valve, clack, clapper valve
a simple valve with a hinge on one side; allows fluid to flow in only one direction
Synonyms: clap, clack valve, clapper valve, clack
3. (verb) clatter, clack, brattle
make a rattling sound
Synonyms: palaver, click, tittle-tattle, tattle, gabble, blab, piffle, chatter, maunder, gibber, prate, prattle, clack, brattle, cluck, blabber, twaddle, clatter
4. (verb) cluck, click, clack
make a clucking sounds, characteristic of hens
Synonyms: tattle, palaver, click, tittle-tattle, penetrate, dawn, brattle, flick, get through, sink in, gabble, blab, piffle, come home, maunder, chatter, gibber, prate, snap, tick, prattle, clack, cluck, get across, blabber, fall into place, twaddle, clatter
5. (verb) chatter, piffle, palaver, prate, tittle-tattle, twaddle, clack, maunder, prattle, blab, gibber, tattle, blabber, gabble
speak (about unimportant matters) rapidly and incessantly
Synonyms: inveigle, chitchat, brattle, mumble, cluck, shoot the breeze, babble, let the cat out of the bag, twaddle, clatter, gossip, prattle, sing, palaver, blarney, chit-chat, claver, tittle-tattle, maunder, sweet-talk, chew the fat, mutter, peach, tattle, natter, wheedle, visit, confab, blab out, coax, gibber, cajole, blab, talk, spill the beans, piffle, confabulate, click, jaw, babble out, mussitate, prate, chat, chatter, chaffer, gabble, blabber, clack
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Synonyms and Antonyms of clack 
