1. To remove the fuse from an explosive device to prevent it from detonating
The bomb expert worked carefully to defuse the explosive.
O especialista em bombas trabalhou cuidadosamente para desativar o explosivo.
2. To reduce tension or resolve a potentially dangerous or hostile situation
She managed to defuse the argument before it escalated.
Ela conseguiu desativar a discussão antes que piorasse.
3. To make something less tense, serious, or threatening
His humor helped defuse the awkward atmosphere in the room.
Seu senso de humor ajudou a aliviar a atmosfera constrangedora na sala.