Definition of carte blanche noun from the Oxford Advanced Learner's Dictionary

 

carte blanche

 noun
noun
BrE BrE//ˌkɑːt ˈblɑːnʃ//
 
; NAmE NAmE//ˌkɑːrt ˈblɑːnʃ//
 
 
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[uncountable] (from French) carte blanche (to do something) the complete freedom or authority to do whatever you like He was given carte blanche to say what he liked in the report. to have carte blanche Word Origin late 17th cent.: French, literally ‘blank paper’ (i.e. a blank sheet on which to write whatever one wishes, particularly one's own terms for an agreement).
See the Oxford Advanced American Dictionary entry: carte blanche