noun Date: 15th century an act or the process of reversing, a conversion of a photographic positive into a negative or vice versa, a change (as of fortune) often for the worse
REVERSAL
Meaning of REVERSAL in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012