prebreathe

transitive verb
pre·breathe | \ (ˈ)prē-ˈbrēt͟h \
prebreathed; prebreathing

Medical Definition of prebreathe 

: 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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occurring twice a year or every two years

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