yellow-bellied . yellow-bellied {adj.}, {slang} Extremely timid, cowardly. Joe Bennett is a yellow-bellied guy, don't send him on such a tough assignment! Categories: add yours {adj.} {slang} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 » In RussianTo section: Y Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Leave my opinion