burnt my bridges

• v. 破釜沉舟(背水布阵；断绝退路)

burnt my bridges的用法和样例：

例句

1. I wasn't sure about removing that tree, but I've burned my bridges and chopped it down now.
   当时我吃不准是否要把那棵树移掉，但是现在我已把它砍倒了，已无法挽回。