The phrase "to expand the discussion" means to broaden or extend a conversation, discussion or debate to include more topics, ideas or viewpoints. Full definition
The two leaders agreed to strengthen legal migration and made a commitment to expand discussions on how to stem the tide of illegal migration. (punchng.com)
But with this article, I want to expand this discussion from just the diet of the animal to another possibly even MORE important factor that nobody is really talking about. (truthaboutabs.com)
I invite overseas teachers and administrators reading this post to expand the discussion by commenting with their insights and experiences. (edutopia.org)