flatfoot . flatfoot {n.}, {slang}, {derogatory} A policeman. "What does Joe do for a living? — He's a flatfoot." Categories: add yours {derogatory} {n.} {slang} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 » In RussianTo section: F Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Post my comment