This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Third-person singular simple present indicative form of expatiate.

"All that could have been a blind, as Mr. Pearce expatiates at length, but it is a bold step to be certain that appearances deceive us."

expatiated    expatiates    expatiating   

clarify    clear up    elucidate   

specialize    detail    exemplify    set forth    illustrate   

descant    expand    spread    extend    diffuse