If you consider him a miracle man, you're overrating him.

如果你认为他能创造奇迹，那你是高估他了。

This idiom is used to mean overrating oneself and trying to do what is beyond one's ability. The result can be nothing but failure.

这个成语比喻高估自己去做自己能力以外的事情，这样的结果只有失败。

The ne'er-do-wells that fuelled the mortgage crisis by overrating trillions of dollars of dodgy debt have had a relatively easy time of it recently.

那些无用而不负责的人最近的日子变得相对好过些了，他们对数万亿美元不良债务进行过高估计从而刺激了次贷危机的产生。

But given the financial fiasco in the EU in the past two years, EU partisans now seem to be significantly overrating the appeal of membership to prospective candidate nations.

但在过去两年经历了财政惨败之后，欧盟党羽现在似乎大大高估了成员资格对预期候选国家的吸引力。