The phrase "giving carte blanche" is commonly used to indicate that someone has been given the freedom or authority to act as they see fit, without any restrictions or limitations. Antonyms for this phrase would include terms such as "restricting," "limiting," or "constraining," which all indicate a lack of freedom or the presence of barriers. Other antonyms might include "denying authority," "withholding permission," or "setting boundaries," which indicate a refusal to grant someone complete freedom or autonomy. By contrast, synonyms for "giving carte blanche" might include terms such as "empowering," "authorizing," or "granting freedom," which all convey a sense of trust and confidence in someone's ability to act responsibly and independently.