A blank check could also refer to the completely blank checks that are received from a check printing company. These blank checks do not yet have an authorized signature and are sometimes referred to as check stock. These checks should be stored in a secure place until they are inserted into the company's printer in order to pay its suppliers, etc.
Lastly, blank check sometimes indicates that a large, uncertain amount has been authorized in order to accomplish something. For example, a rich grandparent might indicate that an only grandchild will have a blank check as far as the cost of education.
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