Making light, quick chirping sounds like birds, or nervously talking a lot without saying much of importance.
From Old English 'twiteren,' imitating the sound birds make. The word originally described the actual chirping of birds, but by the 1500s also came to mean nervous, rapid speech.
The word itself sounds like what it means—say it aloud and you're basically doing the action! This is called onomatopoeia, and it's why 'Twitter' the social media platform was named that—it's all about quick, rapid-fire messages.
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