reversal

1. N-COUNT A reversal of a process, policy, or trend is a complete change in it. 彻底改变; 逆转

The paper says the move represents a complete reversal of previous U.S. policy. 报上说这一举动反映了之前美国政策的彻底逆转。

2. N-COUNT When there is a role reversal or a reversal of roles, two people or groups exchange their positions or functions. (位置或功能的) 转变

When children end up taking care of their parents, it is a strange role reversal indeed. 当孩子们最终照看起父母来的时候，这确实是一个奇怪的角色转变。