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to spend less money than you did before because you have less money
勒紧裤带，省吃俭用
I've had to tighten my belt since I stopped working full-time.
自从我停止全职工作以来，就不得不勒紧裤带过日子。
Clearly, if you are spending more than your income, you'll need to tighten your belt.
明摆着，要是你入不敷出，你就得省着点了。