underway underway {adv. phr.} In progress; in motion. The yearly fund-raising campaign for the renovation of our university campus is already underway. Categories: add yours {adv. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: U Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Comment on this entry