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- Military. a turn of 180° from the position of attention.
- a complete, sudden change in position, direction, principle, attitude, etc.: They’ve done an about-face in their foreign policy.
verb (used without object), a·bout-faced, a·bout-fac·ing.
- to execute an about face.
- to turn in the opposite direction.
- to switch to an opposite opinion.
- (used as a military command to perform an about-face).