pop in pop in {v. phr.} To suddenly appear without announcement. "Just pop into my office any time you're on campus," Professor Brown said. Categories: add yours add yours time {v. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2025 To section: P Subscribe to: American Idioms► Also consider the parent subscriptions (3)Idioms feedEnglish languageHome page and general feed Leave my opinion Leave my opinion