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v. Present participle of expatiate.

"The gift was a brimming bowl of exotic fruits from Fortnum & Mason, which Fry toyed with as he spoke – a dragon fruit while discussing his kleptomania; a crambola while arguing the creative advantages of celibacy; a durian while expatiating on his theory that not everything is like it is for a reason."

expatiated    expatiates    expatiating   

clarify    clear up    elucidate   

specialize    detail    exemplify    set forth    illustrate   

descant    expand    spread    extend    diffuse