Usage Note
Brabbeln is informal and describes low, mumbled, indistinct speech — used for someone muttering to themselves, a baby babbling, or someone speaking so unclearly they can't be understood.
Examples
"Das Kind brabbelte vor sich hin, ohne dass man es verstehen konnte."
Natural Translation
The child babbled away to itself without anyone being able to understand it.
Literal Translation
The child babbled before itself, without that one it understand could.

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