Examples:

• You want a blank cheque, or the life within me?
• I'm giving you a blank cheque along with this bag.
• In other words, you're asking for a blank cheque.
• I am not prepared to sign a blank cheque.
• But still we cannot give you a blank cheque.
• In my mind that would amount to giving a blank cheque.
• Your support is not a blank cheque.
• Like a blank cheque, it has no value.
• That doesn't yet give you a blank cheque.
• So it is not a blank cheque.