0 a cheque that has been signed but does not yet have the amount of money written on it
1 a very large amount of money given to a person or organization to spend, or permission to spend a very large amount of money:
2 a cheque that someone has signed but does not have an amount of money written on it:
I wish you would send me a blank cheque, in a letter so that if I want money I may be able to draw for a little.
If you send me a blank cheque, I suppose W. or Murray would give me the money.
Tell your aunt I will give her a blank cheque for the cost, and she may fill it in.
Nor is it a blank cheque to be sent to the poorest countries and regions.
Yet writing a blank cheque is, of course, no solution.
It is not a blank cheque for copyright holders.
We cannot just issue a blank cheque, nor would we want to.
There is no blank cheque; instead we are getting a study.