a change of direction(朝反方向的)倒转
I'd only gone a little way down the street when I remembered I hadn't locked the door, so I made/did a quick about-turn.我在街上刚走出不远就想起来忘锁门了,于是马上转身跑回去。
a complete change of opinion or behaviour(意见或行为的)彻底转变
This is the government's second about-turn on the issue.这是政府在这个问题上立场第二次180度大转变。