The phrase "puts over" means to successfully communicate or convince someone of something. Some antonyms for this could be to fail, to struggle, or to misunderstand. If someone is unable to put something over, they may be perceived as weak or ineffective in their communication skills. On the other hand, if someone is able to put something over successfully, they may be considered a strong communicator or persuasive speaker. It's important to note that the success or failure of putting something over is subjective and can vary depending on the situation and the audience.