about-face about-face /əˈbaʊt ˌfeɪs/

noun

1. A major change in attitude, principle or point of view  ( about-face , policy change , reversal , volte-face )
   a major change in attitude, principle or point of view
    An about-face on foreign policy
   an about-face on foreign policy
   
2. Act of pivoting 180 degrees, especially in a military formation  ( about turn , about-face )
   act of pivoting 180 degrees, especially in a military formation
   

verb

1. () Turn, usually 180 degrees  ( about-face )
   turn, usually 180 degrees
   
2. Change one's mind and assume the opposite viewpoint  ( about-face )
   change one's mind and assume the opposite viewpoint