reversal
/rɪˈvɜːsəl/noun
1- a change to an opposite direction, position, or course of action反向; 反转; 倒转; 颠倒：
a dramatic reversal in population decline in the Alps
阿尔卑斯山地区人口下降的大逆转
mass noun the reversal of tidal currents.潮流的回流。
1.1
- Law an annulment of a judgement, sentence, or decree made by a lower court or authority【律】（对下级法院或权力机构裁决、宣判或法令的）撤销, 废弃：
a reversal by the House of Lords of the Court of Appeal's decision.
上议院对上诉法院判决的撤销。
1.2
- an adverse change of fortune（运气）逆转：
the champions suffered a League reversal at Gloucester last month.
上月冠军队在格洛斯特联赛比赛中运气逆转。
1.3
- mass noun Photography direct production of a positive image from an exposed film or plate; direct reproduction of a positive or negative image【摄】反转。
词源
late 15th cent. (as a legal term)： from the verb REVERSE + -AL.