better half better half {n.}, {informal} One's marriage partner (mostly said by men about their wives.) "This is my better half, Mary," said Joe. Categories: add yours add yours {informal} {n.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2025 To section: B Subscribe to: American Idioms► Also consider the parent subscriptions (3)Idioms feedEnglish languageHome page and general feed Discuss Discuss