In the figurative sense, it is used to describe a situation in which an agreement has been made that is open-ended or vague, and therefore subject to abuse, or in which a party is willing to consider any expense in the pursuance of their goals.
Under American law, a blank cheque is an example of an "incomplete instrument" as defined in the Uniform Commercial Code's Article 3, Section 115 (a).
The Emperor Francis Joseph may, however, rest assured that His Majesty will faithfully stand by Austria-Hungary, as is required by the obligations of his alliance and of his ancient friendship.
"I understand that you give me carte blanche to act for you, provided only that I get back the gems, and that you place no limit on the sum I may draw."
Dame Agatha Christie uses the term carte blanche in her first published book where she introduced Hercule Poirot to the reading public.