blow in . blow in {v.}, {slang} To arrive unexpectedly or in a carefree way. The house was already full of guests when Bill blew in. Compare SHOW UP (3). Categories: add yours {slang} {v.} 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