Simple past tense and past participle of expound.(verb)
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Use "expounded" in a sentence
"It was there that Letwin expounded the central ethos of the Cameron policy towards the EU, which amounts to a belief that that Britain needed membership of the EU."
"St. St.phen's audiences have listened to some of the world's best orators, and have had the word expounded by superior doctors of divinity."
"So St. Stephen's audiences have listened to some of the world's best orators, and have had the word expounded by superior doctors of divinity."