When it comes to involving someone or including them in a particular situation or discussion, there are several synonyms for the phrase "bring someone in". Firstly, "invite" suggests requesting someone's attendance or participation in a specific event or gathering. Similarly, "engage" indicates actively involving someone in a particular task or activity. "Introduce" conveys the notion of presenting someone to a group or bringing them into a conversation. Additionally, "include" implies incorporating someone into a particular group or project. "Incorporate" suggests merging someone's skills or ideas into a given context. Lastly, "bring on board" conveys the idea of actively involving and welcoming someone as a member or participant in an organization or team.