run out on run out on {v. phr.} To leave someone in the lurch; abandon another. When Ted ran out on Delores, she got so angry that she sued him for divorce. Categories: add yours {v. phr.} 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 Discuss