an act or instance of reversing.

the state of being reversed.

an adverse change of fortune; reverse.

Law . the setting aside of a decision of a lower court by a higher court.

noun

annulment , backpedaling , cancellation , change in direction , doubleback , repeal , rescinding , retraction , switch , turnabout , turnaround , u-turn , volte-face , inversion , transposition , backset , setback , recall , rescission , revocation , about-face , anticlimax , bathos , metathesis , mutation , peripety