in error . in error {adv. phr.} Wrong; mistaken. You were in error when you assumed that he would wait for us. Categories: add yours {adv. phr.} 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 Add my comment