Learner's definition of REVERSAL
a change to an opposite state, condition, decision, etc.
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.
◊ Reversal often means a change to a worse state or condition.