verb (used with object) 1.to remove the air pressure from (a
pressurized compartment of an aircraft or spacecraft).
2.to relieve the tensions of; cause to relax: A week's vacation should depressurize me.
verb (used without object) 3.to lose air pressure: The airplane cabin depressurized almost instantly.
Also, especially British, de·pres·sur·ise.
Related forms de·pres·sur·i·za·tion, noun
de·pres·sur·iz·er, noun