re·vers·al/rɪ`vɜsəl; rɪˈvɜːsəl/ n 1 [C,U] when something changes and becomes the opposite of what it was before 逆转; 倒转; 彻底的改变: a reversal of the previous policy 过去政策的逆转 2 [C] formal a failure or problem that prevents you from doing what you want 【正式】 〔阻止人达到目标的〕失败; 麻烦; 厄运