1. removes the fuse from (a bomb or explosive device) to make it safe
2. reduces the tension or danger in (a difficult situation)

Examples

• The bomb squad carefully defuses the explosive device.
• She defuses tense situations with her calm demeanor.
• The mediator defuses the conflict between the two parties.
• He defuses his anger by taking deep breaths.
• The comedian defuses awkward moments with humor.
• The negotiator defuses the hostage situation peacefully.