The phrase "about face" means to make a 180-degree turn to face the opposite direction, originally a military drill command. Figuratively, it also refers to a complete or sudden reversal in direction, opinion, attitude, behavior, or point of view. For example, when someone does an "about-face" on a policy or stance, they drastically change their opinion or decision.
The term comes from a military context where "about" means around or turning, and "face" is the verb meaning to turn. Soldiers respond to the command "about-face" by turning around to face the opposite way.
In summary:
- Literally: a sharp turn of 180 degrees.
- Figuratively: a complete change in opinion or behavior.
This expression is common in both military and everyday language for indicating reversals.