- a bank check bearing a signature but no stated amount.
- unrestricted authority; a free hand: He was given a blank check in the choice of personnel for the new department.
Origin of blank check
Idioms and Phrases with blank check
Unrestricted authority, a free hand, as in I'll support most of the chairman's agenda, but I'm not ready to give him a blank check for the company's future. Literally this term signifies a bank check that is signed by the drawer but does not indicate the amount of money, which is filled in by the person to whom it is given. [Late 1800s]