When it comes to synonyms for "going in," there are several options to choose from, depending on the context. For example, "entering" is a suitable synonym that conveys the act of physically moving into a space or area. "Approaching" also works in certain situations, such as when someone is about to start a conversation or begin a task. Additionally, "beginning" can be used when referring to the start of a process or event. Other synonyms might include "initiating," "commencing," or "embarking on." Ultimately, the most appropriate synonym will depend on the specific situation and the connotations that the speaker or writer wishes to convey.