Definition of reversal noun from the Oxford Advanced American Dictionary

      

    reversal

     noun
    noun
    NAmE//rɪˈvərsl//
     
     
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  1. 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.
  2. 2[countable] a change from being successful to having problems or being defeated the team's recent reversal The company's financial problems were only a temporary reversal.
  3. 3 [countable, uncountable] an exchange of positions or functions between two or more people It's a complete role reversal/reversal of roles (= for example when a husband takes care of the house and children while the wife works).
See the Oxford Advanced Learner's Dictionary entry: reversal