expatiate - 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"
Expatiating upon this learned and remarkable theory, and citing many curious statistical and other facts in its support, Sam Weller beguiled the time until they reached Dunchurch, where a dry postboy and fresh horses were procured; the next stage was Daventry, and the next Towcester; and at the end of each stage it rained harder than it had done at the beginning.
Governor Bellingham, in a loose gown and easy cap -- such as elderly gentlemen loved to endue themselves with, in their domestic privacy -- walked foremost, and appeared to be showing off his estate, and expatiating on his projected improvements.
The captain was expatiating in a low conversational tone to the chief mate upon the danger of these derelicts, and upon his dread of coming upon them at night, when suddenly a man forward screamed out, "There's people on board of her, sir!
