chun ‧ ter /ˈtʃʌntə $ -ər/ BrE AmE verb [intransitive] British English informal
to talk for a long time, usually about something that is not interesting:
He was chuntering on about the problems he was having with his car.
chun ‧ ter /ˈtʃʌntə $ -ər/ BrE AmE verb [intransitive] British English informal
to talk for a long time, usually about something that is not interesting:
He was chuntering on about the problems he was having with his car.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012