down on down on {adj. phr.}, {informal} Having a grudge against; angry at. John is down on his teacher because she gave him a low grade. Categories: add yours {adj. phr.} {informal} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: D Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Post my comment