Dar carta blanca
Example: El jefe me dio carta blanca para organizar la fiesta.
Definition
"Dar carta blanca" means to give someone complete freedom or full authority to act as they see fit, without restrictions or needing further approval. For example, when the boss gave me "carta blanca" to organize the party, I could decide everything on my own.
Etymology
The expression "dar carta blanca" literally translates to "give a white paper". Historically, a blank or white document symbolized unrestricted permission, allowing the holder to fill in the terms as they wished. Thus, "dar carta blanca" came to mean granting full freedom or authority to someone.
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"Dar carta blanca" appears in the Vocaplus list "Spanish - General - Modismos y refranes - (C1) - parte 1", containing 120 commonly used expressions.
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to give free rein