carte blanche
/kɑːt ˈblɑːnʃ
/noun
1 [mass noun] Complete freedom to act as one wishes: the architect given carte blanche to design the store...
- The letter directs him to use his discretion, but he's given carte blanche to tell them whatever he wants.
- You are given carte blanche to tell people what you think, and as long as you don't actually stab someone, you will be pretty much forgiven.
- They were given carte blanche to come up with their very best model.
2(In piquet) a hand containing no court cards as dealt.
Origin
Late 17th century: French, literally 'blank paper' (i.e. a blank sheet on which to write whatever one wishes, particularly one's own terms for an agreement).