talk big talk big {v.}, {informal} To talk boastfully; brag. He talks big about his pitching, but he hasn't won a game. Categories: add yours {informal} {v.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: T Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Discuss