tighten the purse strings Definition

purse strings
plural noun

1. formerly
The two cords which, when pulled, draw the opening of a purse up in order to close it.

Idiom: hold the purse strings (control the purse strings)

To be in charge of the financial side of things, eg in a family, business, etc.

Idiom: loosen the purse strings

To allow for greater financial freedom.

Idiom: tighten the purse strings

To impose financial restraint.

Etymology: 15c.