I've already made up my mind. There's no sense beating a dead horse.

我已经下了决心，不要再白费口舌了。

keep in line:

①保持在线内，排队

②管束

例句：

He needs to be kept in line. He's too wild.

他太野了，要好好管束一下。

put someone out:

①把某人推出去

②给某人添麻烦

例句：

I don't want to put you out.

我不想给你添麻烦。

get a leg up:

把脚抬起 ×

√

例句：

We have got a leg up on our competitors

对于竞争对手来说，我们已经占了上风了。