jaw drop . jaw drop or jaw drop a mile {informal} Mouth fall wide open with surprise. — Used with a possessive. Tom's jaw dropped a mile when he won the prize. Categories: add yours {informal} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: J Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Post my comment