The antonyms for "allowing entrance" include "preventing entrance," "denying entrance," "prohibiting entrance," or "forbidding entrance." These words indicate a refusal or prohibition of entry to a particular place or location. To use these words, you might say, "The bouncer prevented entrance to the club for those without proper identification" or "The museum denied entrance to those without tickets." These antonyms are useful in situations where access to certain areas or events is restricted for security, privacy, or other reasons. In contrast, allowing entrance suggests a welcoming and permissive attitude towards visitors, guests, or customers.