in one's mouth . in one's mouth See: BUTTER WOULDN'T MELT IN ONE'S MOUTH, MELT IN ONE'S MOUTH. No categories: add yours Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: I Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Post my comment