wash out . wash out {v. phr.} To disappear; vanish. Do you think this stain will wash out? Categories: add yours {v. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: W Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Post my comment