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v. Simple past tense and past participle of expatiate.

"As for Alfred Tennyson Dickens, broken in the depression of the 1890s, a firm of theatrical producers of Melbourne would ultimately organise tours of Britain and America where he read from his father's work and expatiated on his father's life."

expatiated    expatiates    expatiating   

clarify    clear up    elucidate   

specialize    detail    exemplify    set forth    illustrate   

descant    expand    spread    extend    diffuse