catch out

发觉 ... 有错误(或做坏事)

例句与用法：

He told us he was an Englishman, but was soon caught out when he pronounced some words in an apparently un- English way.

他对我们说他是英国人，可是很快就被揭穿了，因为他把几个词的音发得明显地不符合英国习惯。

Occasionally, unusual creatures are washed to the shore, but they are rarely caught out at sea.

偶尔，一些罕见的动物被冲到岸上来，但是它们在海上却很少能被捕捉到。