1 [uncountable and countable]
a change to an opposite arrangement, process, or way of doing something [↪ turnaround]
a sudden reversal of government policy
a dramatic reversal in population decline
Some Internet firms have suffered a painful reversal of fortune (=they were successful but now they are not).
Some carers and dependants find it difficult to adapt to a role reversal.
a failure or other problem that prevents you from being able to do what you want:
In spite of setbacks and reversals, his business was at last making money.