breached breac·hed UK/bɹiːt͡ʃt/ US/ˈbritʃt/ uncommon adjective 1. forcibly broken through or opened up “the enemy poured through the breached line of defense” Similarbroken WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.