fair-weather friend . fair-weather friend {n.} A person who is a friend only when you are successful. Everyone knows that John's only a fair-weather friend. Categories: add yours add yours friends {n.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2025 To section: F Subscribe to: American Idioms► Also consider the parent subscriptions (3)Idioms feedEnglish languageHome page and general feed Discuss Discuss