chatter

Concise Oxford English Dictionary © 2008 Oxford University Press:
chatter/ˈtʃatə(r)/

▶verb

• 1 talk informally about minor matters.

• 2 (of a bird, monkey, or machine) make a series of short, quick high-pitched sounds.

• 3 (of a person's teeth) click repeatedly together from cold or fear.

▶noun

• 1 informal talk.

• 2 a series of short, quick high-pitched sounds.

– phrases
the chattering classes derogatory educated or intellectual people considered as a social group given to the expression of liberal opinions.

– derivatives
chatterer noun,
chattery adjective.

– origin ME: imitative.