break off  打击，折断，脱离，结束（话，关系等），中断

　　Did it break off or did someone break it? 是它自己脱落的还是有人弄坏的？

　　My father broke off his affair with Cindy. 我爸爸和辛迪断绝了关系。

　　If you want, I'll just break it off with her. 如果你愿意，我就马上和她断绝来往。

　　The mirror broke off the car door.  镜片从车身掉了出去。

　　It will have to be replaced.  必须要换一个。