Brit. <英>
1
- (chiefly in military contexts) a turn made so as to face the opposite direction（主要作军事用语）向后转：
he did an about-turn and marched out of the tent.
他向后转, 大步迈出了帐篷。
1.1
- informal a complete change of opinion or policy〈非正式〉（看法或政策的）彻底改变：
the government made an about-turn over the bill.
政府对该法案的态度来了个180度大转弯。
exclamation
about turn!
- (in military contexts) a command to make an about-turn（军事用语）向后转！
词源
late 19th cent. (originally as a military command)： shortening of right about turn.