hook up . hook up {v. phr.} To connect or fit together. The company sent a man to hook up the telephone. They could not use the gas stove because it had not been hooked up. Categories: add yours {v. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2025 To section: H Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Leave my opinion