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• v  decrease the pressure of
  depressurize the cabin in the air plane

• During Apollo's eleventh revolution, as Stafford and Cernan prepared to undock Snoopy for its descent toward the moon, the astronauts found that they could not depressurize the .
• Soviet officials later revealed that a valve had opened when the capsule separated from the Salyut 1 space station, allowing the cabin to depressurize.

• depressurise
• decompress

• pressurize
• pressurise

News & Articles

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• Chevron Continues To Depressurize West Texas Pipeline
  Chevron Continues To Depressurize West Texas Pipeline
  Nov. 15, 2013 - Nasdaq
• Update on Chevron West Texas LPG Pipeline Incident
  Chevron is continuing to depressurize the West Texas LPG pipeline that ruptured and subsequently ignited today at approximately 9:30 AM CST. The fire continues to decrease in size as residual product is flared and burned-off.
  Nov. 15, 2013 - Business Wire via Yahoo! Finance
• Fire from Milford gas pipeline explosion decreasing
  Chevron officials say the fire that sparked Thursday morning at the West Texas LPG pipeline in Ellis County is decreasing in size as crews on site continue to remove product from and depressurize the pipeline.
  Nov. 14, 2013 - FOX 4 News Dallas - Fort Worth

Quotes

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• Paul Stanley in Los Angeles Times
  Stanley began painting in 2000 "to let off steam and depressurize."