redcap redcap {n.} A porter at an airport or at a railroad station. Mr. Smith works as a redcap at Chicago's O'Hare Airport. Categories: add yours {n.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: R Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Post my comment