about face
完全改变方向或主意
正式/口语·形容突然改变决定或态度
英文释义
to completely change one's opinion, attitude, or direction
例句
The government did an about face on the tax policy after public outcry.
典故来源
源自军事口令，士兵向后转的动作，引申为立场或方向的彻底转变。