In a state of excited agitation or nervous anticipation; all aflutter with emotion or activity.
From prefix 'a-' (in a state of) + 'twitter' (to tremble or chirp). The word 'twitter' comes from Old English 'twiterian,' meaning to twitter or chirp like a bird. The 'a-' prefix was added to create an adjective meaning 'in a state of twittering' or excitement.
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