powder room powder room {n.} The ladies' rest room. When they got to the restaurant, Mary went to the powder room to wash up. Categories: add yours {n.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 » In RussianTo section: P Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Comment on this entry