表达 push one's luck 可以理解为“得寸进尺，过分要求”，已经做了有风险的事情，不但不收手还变本加厉，继续做下去。人们常用 “don't push your luck 你别得寸进尺”作为善意的警告，告诉他人你该见好就收了。这个表达也可以写为 push it 或者 don't push it，意思是一样的。

例句

My sister agreed to help out on Saturday, do you think I might be pushing my luck if I asked her to stay for the whole week?

我妹妹同意星期六来帮我们，你说，如果我让她再多呆一个星期，是不是就有点过分了？

You've had a good run so far, don't push your luck!

你已经够幸运的了，别得寸进尺啊！

You should be glad that he let you off with a warning this time. Don't push it!

你应该谢天谢地他这次仅仅是给了你一个警告。别太过分了！