reversal
/rɪˈvɜ:sl; rɪ`vəsl/ n[C, U]
1 (instance of) making sth the opposite of what it was; turning around 反转; 倒向; 颠倒
a dramatic reversal of her earlier decision 她的突然改变决定
a reversal of the usual procedures, tendencies, opinions 常规的颠倒、 趋势的扭转、 意见的转变
(fig 比喻) His luck suffered a cruelreversal, ie change for the worse. 他遭逢厄运.
2 (instanceof) exchanging two positions, functions, etc （位置、 功能等的）转换
role reversal/reversal of roles, eg between husband and wife when the husband looks after the house and children while the wife works 角色的转换（如夫妻之间由男方料理家务、 照看小孩而女方工作）.