To speak rapidly and unintelligibly; to chatter or make meaningless sounds.
Possibly imitative in origin, mimicking the sound of rapid, unclear speech. First recorded in English in the early 1600s, it may be related to 'gab' and other onomatopoetic words.
Gibber is one of those wonderfully onomatopoetic words that actually sounds like what it means—say it fast and you can almost hear someone babbling nervously, which is why Shakespeare and other writers loved using it!
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