coop up coop up {v. phr.} To hedge in; confine; enclose in a small place. How can poor Jane work in that small office, cooped up all day long? Categories: add yours {v. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2025 To section: C Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Post my comment