burble
[ˈbɜ:rbl]
vi.
（流水）发汩汩声;
（婴孩般）咿呀学语;
嘟囔;
窃笑;
n.
空谈，漩涡;
例句:
-
Just as babies burble before they say words.
来自SA
-
It's possible, in fact, to count on one hand the instances where the layman could isolate dubstep's signature burble.
来自BBC
-
You warm to a chap who, when a girl says "I'm Katie" can only burble that he had a dog called Katie that got put down.
来自THETIMES