1. to reduce or remove air pressure from something

Examples

• The airplane cabin began to depressurize during the flight.
• Engineers need to depressurize the tank before maintenance.
• The spacecraft will depressurize when the airlock opens.
• Safety protocols require workers to depressurize the system first.
• The diving chamber must depressurize slowly to prevent injury.
• A malfunction caused the submarine to depressurize rapidly.