U-turn 政策、战略、态度的急剧地根本性地改变
The democratic party used to be against the tax increase,but since the runaway inflation,it took a U-turn on its tax policy.
民主党本来是反对加税计划的,但由于通货膨胀加剧,民主党的税收政策来了个180度的大转弯.

sell oneself short 自卑,自贱,妄自菲薄
Don't sell yourself short,Mark. You can achieve anything if you really try.
马克，别自卑(或别小瞧你自己）！如果你真下恒心的话，什么事都能做好的。

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