"chatter" in the noun sense
1. yak, yack, yakety-yak, chatter, cackle
2. chatter, chattering
the rapid series of noises made by the parts of a machine
3. chatter, chattering
the high-pitched continuing noise made by animals (birds or monkeys)
"chatter" in the verb sense
1. chatter, click
click repeatedly or uncontrollably
cut unevenly with a chattering tool
3. chew the fat, shoot the breeze, chat, confabulate, confab, chitchat, chit-chat, chatter, chaffer, natter, gossip, jaw, claver, visit
talk socially without exchanging too much information
"the men were sitting in the cafe and shooting the breeze"
4. chatter, piffle, palaver, prate, tittle-tattle, twaddle, clack, maunder, prattle, blab, gibber, tattle, blabber, gabble
speak (about unimportant matters) rapidly and incessantly
make noise as if chattering away
"The magpies were chattering in the trees"
Source: WordNet® (An amazing lexical database of English)
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