excited; nervous; aflutter; twittering: They were atwitter at the prospect of meeting a Hollywood star.

Origin of atwitter

First recorded in 1825–35; a-1 + twitter Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for atwitter

Contemporary Examples of atwitter

Word Origin and History for atwitter

1833, from a- (1) + twitter.

Online Etymology Dictionary, © 2010 Douglas Harper