whodunit whodunit {n.} A detective story; a murder story; a thriller. Agatha Christie was a true master of the whodunit. Categories: add yours {n.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: W Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Add my comment