To lay open the meaning of, to explain or discuss at length.
elaborate or expatiate upon; give details; "She elaborated on her plans"
add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing; "She elaborated on the main ideas in her dissertation"
state; "set forth one''s reasons"
add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing