[tighten one's belt] {v. phr.}
To live on less money than usual; use less food and other things.
* /When father lost his job we had to tighten our belts./
Often used in the expression "tighten one's belt another notch".
* /When the husband lost his job, the Smiths had to do without many things, but when their savings were all spent, they had to tighten their belts another notch./