volte-faces

英 [vɒlt ˈfeɪsɪz]

美

n.  (意见或计划的)大转变，完全转变
volte-face的复数

柯林斯词典

• N-COUNT （观点或决定的）大转变，彻底转变，180度大转弯
  If you say that someone's behaviour is avolte-face, you mean that they have changed their opinion or decision completely, so that it is the opposite of what it was before.
  1. The day's events were a remarkable volte-face.
     当日发生的事件是一次惊人的大转折。