noun
the sound of people talking quickly and in a way that is difficult to understand
verb
to talk rapidly and continuously in a foolish, excited, or incomprehensible way
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The professor listened intently as the student began to babble on about their research findings.
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I couldn't understand a word she was babbling about during the meeting.
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Stop babbling nonsense and get to the point!
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The stream babbling through the forest was like nature's own soothing lullaby.