Volte-face - Idioms by The Free Dictionary
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A complete change of opinion or belief. The phrase comes from the Italian term voltafaccia. Everyone was surprised when the candidate made a complete volte-face on her stance on taxes.
a volte-ˈface (from French, formal) a complete change of opinion or plan: This represents a volte-face in government policy.This is a French adaptation of an Italian phrase and refers to turning to face the opposite direction.