belly up . belly up {v.}, {informal} To go bankrupt, become afunctional; to die. Uncompetitive small businesses must eventually all belly up. Categories: add yours death {informal} {v.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 » In RussianTo section: B Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Add my comment