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redout

[ red-out ]
/ ˈrɛdˌaʊt /
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noun

a condition experienced by pilots and astronauts in which blood is forced to the head and results in a reddening of the field of vision during rapid deceleration or in maneuvers that produce a negative gravity force.

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Origin of redout

1940–45; red1 + out, on model of blackout
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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