re·ver·sal 
/rɪˈvɚsəl/ noun
plural re·ver·sals /rɪˈvɚsəl/ noun : a change to an opposite state, condition, decision, etc. [count] ▪ In a sudden reversal, the mayor has decided not to run for reelection. ▪ the reversal of a decision/position/policy ▪ a surprising/sudden reversal in the value of the stock ▪ We had a role reversal. I became the leader and he became the follower. ▪ In a reversal of roles, he is now taking care of his mother. [noncount] ▪ Reversal of the decision is unlikely. ◊Reversal often means a change to a worse state or condition.
▪ He suffered a financial reversal. ▪ The company had a complete reversal of fortune and went bankrupt.
▪ He suffered a financial reversal. ▪ The company had a complete reversal of fortune and went bankrupt.
