Third-person singular simple present indicative form of expatiate.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "expatiates" in a sentence
"Counselor Barnett expatiates on the evils of that other word processing program:"
"All that could have been a blind, as Mr. Pearce expatiates at length, but it is a bold step to be certain that appearances deceive us."
"But the stint ended on a sour note as the Russian partners sought more authority and a reduction in the number of expatiates, mostly former BP employees, who had generous pay packages."