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verb (used with object), de·pres·sur·ized, de·pres·sur·iz·ing.
  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), de·pres·sur·ized, de·pres·sur·iz·ing.
  1. to lose air pressure: The airplane cabin depressurized almost instantly.
Also especially British, de·pres·sur·ise.

Origin of depressurize

First recorded in 1940–45; de- + pressurize
Related formsde·pres·sur·i·za·tion, nounde·pres·sur·iz·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for depressurise



  1. (tr) to reduce the pressure of a gas inside (a container or enclosed space), as in an aircraft cabin
Derived Formsdepressurization or depressurisation, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012