In the army, “About face!” is an order: stop, turn all the way round, and look the other way.

In the army在軍隊裡，"About face!" is an order「About face!」（向後轉！）是一個口令：stop停下來，turn all the way round整個轉過身，and look the other way看向反方向。

From that sharp half-circle, English took a second meaning that has little to do with feet. If someone does an about-face, they change their mind or their behaviour completely — not a little, not slowly, but as if they had spun to face the opposite way. A politician who fought a plan on Monday and praises it on Friday has done an about-face.

From that sharp half-circle從那個俐落的半圈轉身，English took a second meaning英文延伸出第二個意思 that has little to do with feet跟腳其實沒什麼關係。If someone does an about-face如果某人做了一個about-face，they change their mind or their behaviour completely他們的想法或行為徹底改變了——not a little, not slowly不是一點點，也不是慢慢地，but as if they had spun to face the opposite way而是像整個人轉身面向了相反的方向。A politician who fought a plan on Monday一個週一還在反對某個計畫的政治人物 and praises it on Friday週五卻在稱讚它 has done an about-face就是做了一個about-face。

You can use it as a noun (an about-face) or as a verb (to about-face). It is a bit informal and often a bit sharp: it hints that the person used to say the opposite quite loudly.

You can use it as a noun (an about-face)你可以把它當名詞用（an about-face），or as a verb (to about-face)或當動詞用（to about-face）。It is a bit informal and often a bit sharp這個詞有點非正式，也常常帶點尖銳：it hints that the person used to say the opposite quite loudly暗示這個人以前曾經很大聲地說過相反的話。

Newspapers like it. Friends more often say “changed their mind” unless they want that sting. Though actually, people also use it for a real turn of the body, but the opinion-turn is the meaning you will meet far more in reading.

Newspapers like it報紙很愛用它。Friends more often say "changed their mind"朋友之間比較常說「changed their mind」（改變主意了），unless they want that sting除非他們就是想要那種刺一下的效果。Though actually不過事實上，people also use it for a real turn of the body人們也會用它來講身體真的轉了一圈，but the opinion-turn is the meaning you will meet far more in reading但在閱讀裡你會更常遇到「立場轉變」這個意思。