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WordReference Random House Unabridged Dictionary of American English © 2024red•out (red′out′),USA pronunciation n. - Aeronautics, Pathologya 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.
- red1 + out, on model of blackout 1940–45
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