depressurize
🇺🇸
/diːˈpreʃəraɪz/
🇬🇧
/diːˈpreʃəraɪz/
To reduce the pressure inside something, like letting air out of a balloon.
The astronauts had to depressurize the cabin before they could open the hatch.
宇航员必须在打开舱口之前对舱室进行减压。