to talk quickly and continuously, usually about things that are not very important
The two friends chattered happily all the way home.
The class chattered excitedly before the teacher entered.
✦ From Middle English chateren, imitative of the sound of rapid speech.
(of teeth) to knock together repeatedly when you are cold, frightened, or nervous
Her teeth began to chatter in the icy wind.
I was so nervous that my teeth chattered before the interview.
