Bark up the wrong tree 冲着不是目标的树汪汪叫

含义: 在不对头的地方寻找；弄错了的目标。

例句:

John wanted me to get him a job. He's barking up the wrong tree. I don't have that kind of power at my office.

约翰要我帮他找份工作，但他找错了人。我在办公室里没有那么大权力。