Answer:
noun. noun. /rɪˈvərsl/ 1[countable, uncountable] reversal (of something) a change of something so that it is the opposite of what it was a complete/dramatic/sudden reversal of policy the reversal of a decision The governor suffered a total reversal of fortune(s) last week.
Step-by-step explanation:
Reverse is saying going back, (Un) would be the opposite as in forward.