mark off . mark off {v. phr.} Mark with lines; lay out in sections. The field will be marked off in accordance with the special track events that will take place tomorrow. Categories: add yours {v. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: M Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Discuss