- act of pivoting 180 degrees, especially in a military formation
- a major change in attitude or principle or point of view;
"an about-face on foreign policy"
- turn, usually 180 degrees
- change one's mind and assume the opposite viewpoint
- He made an abrupt about-face and left the room.
- His choice of that house was an about-face from his original intention.
- about-faced:about-face n. vi.向后转, 大改变, 倒转, 彻底改变…