reversal - noun

a change from one state to the opposite state

an unfortunate happening that hinders or impedes; something that is thwarting or frustrating

turning in an opposite direction or position

a decision to reverse an earlier decision

a judgment by a higher court that the judgment of a lower court was incorrect and should be set aside

turning in the opposite direction

the act of reversing the order or place of

a major change in attitude or principle or point of view

reversal - thesaurus

blow   reverse   reversion   setback   transposition   turnabout   turnaround