in a flutter in a flutter {adv. phr.}, {informal} In a state of nervous excitement. Whenever Norm and Cathy are near one another, both are in a flutter; they must be in love. Categories: add yours love {adv. phr.} {informal} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: I Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Discuss