Tighten your belt: chi tiêu cẩn thận (to spend less money than you did before because you have less money)

Another bill? I'll have to tighten my belt this month!  

I've had to tighten my belt since I stopped working full-time.

Live beyond one's means: tiêu nhiều hơn số tiền kím được

The cost of living was so much higher in Hanoi that he was soon living beyond his means.

Make ends meet: kiếm tiền đủ chi phí(to have just enough money to pay for the things that you need)

It's hard to make ends meet on such a low salary.

Be/feel under the weather: to be or feel ill

I'm feeling a bit under the weather. I think I'm getting a cold