Noun

• S: (n) about-face, about turn (act of pivoting 180 degrees, especially in a military formation)
• S: (n) about-face, volte-face, reversal, policy change (a major change in attitude or principle or point of view) "an about-face on foreign policy"

Verb

• S: (v) about-face (turn, usually 180 degrees)
• direct hypernym / inherited hypernym / sister term
• derivationally related form
• sentence frame
• S: (v) about-face (change one's mind and assume the opposite viewpoint)