tighten up (someone's) belt

Translations
затянуть (чей-то) пояс
With the new budget cuts, we'll all have to tighten up our belts.
С новыми сокращениями бюджета нам всем придется затянуть пояса.
Definitions
To reduce spending or be more frugal, often due to financial difficulties or the need to save money.