prebreathe
transitive verb
pre·breathe
(ˈ)prē-ˈbrēt͟h 
prebreathed; prebreathing
: to breathe (pure oxygen) to purge the blood of nitrogen content in preparation for an activity (as a space walk) that involves exposure to a significant change in pressure which might otherwise cause decompression sickness
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“Prebreathe.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/prebreathe. Accessed 23 Nov. 2024.
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