Defuse/diːˈfjuːz/ Definition 1 of 3Pro Tip 1/3Calm in Conflict Used when someone prevents a disagreement or fight from getting worse. The teacher's joke defused the tension between the arguing students. Pro Tip 2/3Conflict Resolution Emphasizes the action taken to calmly resolve a heated situation. Dialogue between the leaders helped to defuse the border dispute. Pro Tip 3/3Not Literal It’s often used metaphorically, not involving actual dangerous situations. She defused a potential argument with her apology.