- v add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
- He loves to talk (he does so with unselfconscious self-absorption), to expatiate in professorial detail (with the slightest hint of a lisp).
- I spent part of the day of the debate watching a parade of talking heads expatiate endlessly on how dire was the need for Obama to go macho.
- You want to hear me expatiate on the plethora of Clintonians filling the Obama Administration? Don't have much of an opinion about that, either.