re·ver·sal 
(rĭ-vûrsəl)
(rĭ-vûrsəl)n.
1.
a. The act or an instance of reversing.
b. The state of being reversed.
2. A usually adverse change in fortune: financial reversals.
3. Law The act or an instance of changing or setting aside a lower court's decision by a higher court.
4. Sports A maneuver in wrestling in which a competitor being controlled by the opponent suddenly reverses the situation and gains control.