bur ‧ ble /ˈbɜːb ə l $ ˈbɜːr-/ BrE AmE verb
[ Date: 1300-1400 ; Origin: From the sound ]
1 . [intransitive and transitive] to talk about something in a confused way that is difficult to understand
burble on/away
I had to listen for an hour while she burbled away.
2 . [intransitive] to make a sound like a stream flowing over stones
—burble noun [singular]