level best level best {adj. phr.} One's utmost; one's very best. Eric refused to stay in school although his parents did their level best to make him finish. Categories: add yours {adj. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 » In RussianTo section: L Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Add my comment