pin one's heart on one's sleeve pin one's heart on one's sleeve See: WEAR ONE'S HEART ON ONE'S SLEEVE. Categories: add yours sleeve Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: P Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Leave my opinion