blank check
idiomPart ofblank
blank check — idiom
1. complete freedom to spend money or take action however you wish, with no limits
1.idiom
Definition
complete freedom to spend money or take action however you wish, with no limits set in advance by the person who gave you that permission.
Example
The new manager was given a blank check to restructure the entire sales team.
Voters rarely want to hand any politician a blank check on tax policy.