Carte blanche n. A blank paper, with a person's signature, etc., at the bottom, given to another person, with permission to superscribe what conditions he pleases. Hence: Unconditional terms; unlimited authority.
... Prade, went to M. de Villars and asked leave to conduct an expedition against the chief. He was almost sure of taking Roland by surprise, having procured a guide whose knowledge of the country was minute. The marechal gave him carte blanche. In the evening Menon set out with two hundred grenadiers. He had already put three-quarters of the way behind him without being discovered, when an Englishman met them by chance. This man was serving under Roland, but had been ... — Massacres Of The South (1551-1815) - Celebrated Crimes • Alexandre Dumas, Pere
... have lost too much to think of that or much else. But there is no need of satire, Miss Madison. I will do whatever you wish. That truly is carte blanche enough ... — Taken Alive • E. P. Roe