back-pedal
/ˌbækˈpedəl/verb
no obj.
1- move the pedals of a bicycle backwards in order to brake倒踩自行车的脚踏板（以刹车）。
1.1
- move hastily backwards快速后退：
Cook forced the goalkeeper to back-pedal and push a shot over the bar.
库克迫使守门员快速后退, 把射来的球托出了横梁。
1.2
- reverse one's previous action or opinion行为（或观点）与先前截然相反; 出尔反尔：
Boyd quickly back-pedalled when asked to explain her suggestion.
当被要求解释她的建议时, 博伊德很快就出尔反尔。