a reversal in attitude or principle or point of view; "an about-face on foreign policy"
act of turning to face the opposite direction from the original position (Military); complete change in position or attitude
An about-face is a complete change of attitude or opinion. Few observers believe the president will do an about-face and start spending more. = U-turn, volte-face. a complete change in the way someone thinks or behaves
act of pivoting 180 degrees, especially in a military formation change one's mind and assume the opposite viewpoint turn, usually 180 degrees