volte-face

listen to the pronunciation of volte-face
English - English
a reversal of policy, attitude or principle
If you say that someone's behaviour is a volte-face, you mean that they have changed their opinion or decision completely, so that it is the opposite of what it was before. The day's events were a remarkable volte-face. = about-face. a change to a completely opposite opinion or plan of action = U-turn
a reversal in attitude or principle or point of view; "an about-face on foreign policy"
A dramatic change in mood or tone, commonly in poetry

Shakespeare often used volte faces in the rhyming couplets at the end of his sonnets.

about-face, act of turning to face the opposite direction from the original position (Military); complete change in position or attitude; sudden reversal in opinion or policy
volte-face
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