If you say that someone overreaches themselves, you mean that they fail at something because they are trying to do more than they are able to.
例句
He overreached himself and lost much of his fortune...他的雄心太大,结果损失了自己大部分的财产。The company had overreached itself and made unwise investments...这家公司不自量力地轻率投资。
英汉词典释义
vt.
因过于雄心勃勃而失败
to overreach a goal做得过头而没实现目标
英英词典释义
Verb
1. fail by aiming too high or trying too hard
2. beat through cleverness and wit;
"I beat the traffic""She outfoxed her competitors"