U-turn

剑桥词典

a turn made by a car in order to go back in the direction from which it has come
U 型转弯，180度转弯
It is illegal to do/make a U-turn on a motorway . 在高速路上掉头是违章的。
mainly disapproving
a complete change from one opinion or plan of action to an opposite one
（观念或行为上的）彻底转变
The prime minister did/made a quick U-turn in response to all the adverse publicity . 面对所有这些不利宣传，首相的态度来了个180度的大转弯。 返回 U-turn