v. 25B6; verb
the exhaust was burbling : GURGLE, bubble, murmur, purr, whirr, drone, hum, rumble.
he burbled on : PRATTLE, blather, blether, babble, gabble, prate, drivel, rattle, ramble, maunder, go on, run on; informal jabber, blabber, yatter, gab; Brit. informal rabbit, witter, waffle, chunter; N. Amer. informal run off at the mouth.