When something "becomes public," it means that it is no longer a secret or private matter. There are several synonyms that can be used to convey this idea, such as "come to light," "be exposed," "surface," "be revealed," "be disclosed," "be made known," or "be unveiled." All of these phrases indicate that something previously unknown or hidden has now become public knowledge. The context in which these synonyms are used may vary depending on the nature of the information being shared, but the basic idea remains the same: something that was once private has become open and accessible to all.