1. to reduce or release pressure from a container, system, or enclosed space
Usage: chiefly British spelling; American English typically uses 'depressurize'; commonly used in aviation, engineering, and industrial contexts
2. to reduce emotional or psychological tension or stress
Usage: figurative use; informal

Examples

• The pilot had to depressurise the cabin gradually to avoid discomfort.
• Engineers depressurise the system before performing maintenance.
• The aircraft depressurised rapidly due to a structural failure.
• We need to depressurise the tank before opening it.
• Taking a vacation helps depressurise after a stressful work period.
• The safety valve automatically depressurises the boiler if pressure becomes too high.