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blank check

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noun
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.
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Origin of blank check

First recorded in 1790–95, and in 1885–90 for def. 2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use blank check in a sentence

Other Idioms and Phrases with blank check

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]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
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