means 除了是“方法，手段”的意思，还可以指“金钱；财富；财力；收入”。live beyond your means 指的是入不敷出。

【例句】
If you keep living beyond your means, you'll deplete your bank account before you know it.
如果你继续入不敷出，不知不觉间你的银行存款就会花光。

You have to try to spend less and stop living beyond your means.
你要试着少花一点，别再入不敷出了。