Volte-face
(重定向自Volteface)
Volte-face ( or ) is a total change of position, as in policy or opinion; an about-face.
The expression comes through French, from Italian voltafaccia and Portuguese volte face, composed of volta (turn) and faccia (face).
In the context of politics a volte-face is, in modern English, often referred to as a U-turn or a flip-flop in the UK and the US respectively.