noun
a check with the amount left unspecified, to be filled in by the recipient
adjective
describing the type of check that is blank
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The company's board of directors gave the CEO a blank check to use for any necessary expenses.
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I wish I had a blank check to spend on whatever I wanted.
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He acts like he has a blank check with his parents' credit card.
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Giving someone a blank check in a relationship can lead to problems if there are no boundaries set.