reversal
noun [ C ] uk/rɪˈvɜː.səl/ us/rɪˈvɝː.səl/
C2 反向；倒转；倒退；推翻
the act of changing or making something change to its opposite
He demanded a reversal of the previous decision/policy. 他要求撤销原来的决定／废弃原先的政策。
挫折；失败
a problem or failure
We have suffered a couple of minor/temporary reversals. 我们遭遇了几次小／暂时的挫折。