wear out
1．tire out；exhaust使精疲力尽；耗尽
Playing with little children really wears me out！跟小孩子们在一起玩真把我累坏了。
She keeps wearing herself out for other people．她总是为别人忙得精疲力尽。
After about an hour，my patience began to wear out．大约一小时以后，我开始有点忍耐不住了。
2．become useless变得无用；用坏
The machine has worn out．那台机器已经报废了。
Children's shoes wear out quickly．孩子们的鞋很快就穿坏。
The child has worn out his clothes；will you get him another suit？孩子已经把衣服穿破了，你给他再买一套好吗？
3．consume（time，etc．）tediously 消磨（时间等）
He has worn out miserable days with patience．他耐心地度过了悲惨的岁月。
The meeting wore out all afternoon．会议消磨了整个下午的时间。