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Redout

//ˈɹɛdaʊt// noun

Noun

1
The situation where the body experiences a negative g-force sufficient to cause a blood flow from the lower parts of the body to the head. countable, uncountable
"The heart is unable to sufficiently regulate blood flow to prevent excess blood from flooding the brain's blood vessels and causing redout."
2
Alternative form of redoubt (“military fortification”). alt-of, alternative
"The entrances to the works through the gorge are protected by the traverses G. Closed fieldworks of this type usually designed for defense by one or two companies of infantry with machine guns are called redouts."

From red + out, because it may cause a red appearance in the visual field; compare blackout.

Unscramble this word: redout