Antonyms are words that have the opposite meaning of each other. Therefore, the antonyms of "allow entrance" would refer to actions that prevent or deny entry. Some antonyms for "allow entrance" include words such as prohibit, restrict, block, ban, deny, refuse, and exclude. These words describe actions that stop people or things from entering a particular space or area. For instance, security guards may prohibit people from entering a building without proper identification. Alternatively, a sign may ban entrance to a public area due to safety hazards. In summary, antonyms for "allow entrance" are words that describe actions that prevent people or things from entering specific places.