Antonyms of verb pressurise

1 of 3 senses of pressurise

Sense 3
pressurize, pressurise -- (increase the pressure in or of; "The captain will pressurize the cabin for the passengers' comfort")
       Antonym of depressurise (Sense 1)
      => depressurize, depressurise, decompress -- (decrease the pressure of; "depressurize the cabin in the air plane")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb pressurise

3 senses of pressurise

Sense 1
supercharge, pressurize, pressurise -- (increase the pressure on a gas or liquid)
       => change, alter, modify -- (cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue")

Sense 2
pressurize, pressurise -- (maintain a certain pressure; "the airplane cabin is pressurized"; "pressurize a space suit")
       => keep, maintain, hold -- (keep in a certain state, position, or activity; e.g., "keep clean"; "hold in place"; "She always held herself as a lady"; "The students keep me on my toes")

Sense 3
pressurize, pressurise -- (increase the pressure in or of; "The captain will pressurize the cabin for the passengers' comfort")
       => adjust, set, correct -- (alter or regulate so as to achieve accuracy or conform to a standard; "Adjust the clock, please"; "correct the alignment of the front wheels")