about-face, 《英》 about-turn n. 回れ右; 完全な転換.
【動詞＋】
◆He did an about-face on his earlier stand. 以前の立場を 180 度変えた
･He did an abrupt about-face and left the room. いきなり回れ右をして部屋を出た.
【形容詞･名詞＋】
◆She did a complete about-face and took the opposite position. 180 度態度を変えて反対の立場を取った.
【＋前置詞】
◆He made an about-turn on the issue. その件に関して 180 度見解を変えた.