To reduce or release pressure from something; to lower the pressure inside a sealed container or space.
From de- (remove) + pressure + '-ize' (make/become verb suffix). The '-ize' suffix creates verbs meaning 'to cause to become' or 'to subject to.'
When an airplane cabin depressurizes, oxygen masks drop—it's an emergency because your body relies on air pressure to absorb oxygen, and rapid depressurization is genuinely dangerous.
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