on its last legs

Something that is on its last legs is in such bad condition that it will soon be unable to work as it should.

某事或者某物如果on its last legs，就是说它处于一种非常糟糕的状况，马上就不能正常运转了；快用坏了，快用到头了

I've had this laptop for five years now, and it's really on its last legs.

这个笔记本电脑我已经用了5年了，现在的确是快要报废了。

The company was on its last legs after the manager retired.

公司在经理退休后到了快解体的地步。