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Phrase(s): give someone a blank check [and] give a blank check to someone
1. Lit. to give someone a signed check that lacks only the amount or payment which can be filled in by anyone. • Sally sent a blank check to school with Billy to pay for his books. 2. Fig. to give someone freedom or permission to act as one wishes or thinks necessary. (See also carte blanche.) • He’s been given a blank check with regard to reorganizing the workforce. • The manager has been given no instructions about how to train the staff. The owner just gave him a blank check. • Jean gave the decorator a blank check and said she wanted the whole house done.
McGrawhill's American Idioms And Phrasal Verbs