expatiating
ex-pa-ti-at-ing
verb
Talking or writing at length and in detail about a subject.
"She was expatiating on the joys of gardening."
Thesaurus
Synonyms: dilate, enlarge, exposit, elaborate, expatiate, lucubrate, expand, expound, flesh out
Antonyms: abbreviate, abridge, contract, cut, foreshorten, reduce, shorten