The phrase "lets pass" fails to have any antonyms, as it is not a single word or a phrase with a single meaning. However, the word 'pass' has multiple antonyms depending on its context. When used as a verb meaning to fail or not succeed, the opposite would be to succeed or pass. When used to refer to the act of giving, an antonym could be 'receive' or 'take'. Similarly, when used to refer to the act of moving, antonyms could be 'stop', 'halt', or 'standstill.' Therefore, it's crucial to consider the context when looking for antonyms for the word 'pass'.