red.out

n.（名詞）
A sudden reddening of the visual field accompanied by severe headache and caused by engorgement of the blood vessels of the head when a person is subjected to a negative force of gravity, as in stunt flying.
紅視：發(fā)生于人受到與地球重力相反的力的作用時，伴有強烈的頭痛和由頭部血管擴大引起的視覺突然變紅，如在特技飛行中