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Wiktionary
blank check

alt. 1 (context US English) A signed check of the type used to draw money from a bank account containing no information as to the amount to be paid with it. 2 (context US English) A grant of complete authority to spend an unlimited amount of money, or to take other actions without restraint. n. 1 (context US English) A signed check of the type used to draw money from a bank account containing no information as to the amount to be paid with it. 2 (context US English) A grant of complete authority to spend an unlimited amount of money, or to take other actions without restraint.

WordNet
blank check
  1. n. freedom to do as you see fit; "many have doubts about giving him a free hand to attack" [syn: free hand]

  2. a check that has been signed but with the amount payable left blank [syn: blank cheque]

Wikipedia
Blank Check (film)

Blank Check (originally released as Blank Cheque in the United Kingdom) is a 1994 comedy film directed by Rupert Wainwright, starring Brian Bonsall, Karen Duffy, Miguel Ferrer, James Rebhorn, Tone Lōc, Jayne Atkinson and Michael Lerner and was released by Walt Disney Pictures.

Blank Check (game show)

Blank Check is an American game show that aired on NBC from January 6 to July 4, 1975. It was promoted as "television's first ESP game". Art James was host, with Johnny Jacobs as announcer (though Johnny Gilbert would fill in on occasion).

Created by Jack Barry, this short-lived game was the first one produced by Barry on NBC since the quiz show scandals of the 1950s, and the first of three games Barry produced at NBC (the other two were the syndicated Bullseye and NBC's Hot Potato, both under the Barry & Enright Productions brand).

Usage examples of "blank check".

It was also easier to acquire over the Internet, and for that his intelligence coordinator had a blank check.

Wynand, one can't remember his face--one can, child, one can, it will come back to remind you--it will come back and demand payment--and I'll pay--I signed a blank check long ago and now it's presented for collection--but a blank check is always made out to the sum of everything you've got.

Museum curators around the nation would have happily given any limb he requested or a blank check to obtain his massive library.

The architects for this place had been handed a blank check, and they'd utilized the Gulf oil money well, though the castle wasn't totally authentic.

Well, Mother, as you probably know if you read the magazines, gave Susan a blank check.

And in her wallet, thirty-four dollars and some change and a blank check.