by chance . by chance {adv. phr.} Without any cause or reason; by accident; accidentally. Tom met Bill by chance. The apple fell by chance on Bobby's head. Categories: add yours {adv. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: B Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Discuss