/ ˈbɜːbl; NAmE ˈbɜːrbl/ verb
1.
burble (on) (about sth) ( BrE , disapproving ) to speak in a confused or silly way that is difficult to hear or understand :
[ v ]
What's he burbling about?
[also v speech ]
2.
[ v ] to make the gentle sound of a stream flowing over stones
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WORD ORIGIN
Middle English (in the sense to bubble ): imitative. Current senses date from the late 19th cent.