Expatiate

v. i.	1.	To range at large, or without restraint. [imp. & p. p. Expatiated ; p. pr. & vb. n. Expariating .] Bids his free soul expatiate in the skies. - Pope.
	2.	To enlarge in discourse or writing; to be copious in argument or discussion; to descant. He expatiated on the inconveniences of trade. - Addison.
v. t.	1.	To expand; to spread; to extend; to diffuse; to broaden. Afford art an ample field in which to expatiate itself. - Dryden.

Verb

1.

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" Synonyms: elaborate, expound, lucubrate, flesh out, dilate, exposit, enlarge, expand

amplify, descant, detail, develop, dilate, discuss, dissert, dissertate, elaborate, enlarge, enlarge upon, evolve, expand, explicate, narrate, particularize, ramble, recite, recount, rehearse, rehearse in extenso, relate, relate at large, sermonize, unfold, work out