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blank cheque UK US noun [C, usually singular] UK (US blank check)
► FINANCE a very large amount of money given to a person or organization to spend, or permission to spend a very large amount of money: »
The board has not given me a blank cheque, but enough to really become a big player.
blank cheque to do sth »Banks do not want to give children the impression that they have a blank cheque to spend as much as they please.
► BANKING a cheque that someone has signed but does not have an amount of money written on it: »
It is not a good idea to send blank cheques in the mail.
Financial and business terms. 2012.