U-turn
/ˈjuːˈtɜːn/noun
1- the turning of a vehicle in a U-shaped course so as to face in the opposite directionU型转弯, 180度转弯, 掉头。
1.1
- a change of plan, especially a reversal of political policy（尤指政策）180度转变：
another U-turn by the government.
政府的又一次政策大转变。