belly up . belly up {v.}, {informal} To go bankrupt, become afunctional; to die. Uncompetitive small businesses must eventually all belly up. Categories: add yours add yours death {informal} {v.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2025 » In RussianTo section: B Subscribe to: American Idioms► Also consider the parent subscriptions (3)Idioms feedEnglish languageHome page and general feed Leave my opinion Leave my opinion