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Verb: expatiate  ik'speyshee`eyt
  1. Add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
    - elaborate, lucubrate, exposit, enlarge, flesh out, expand, expound, dilate

Derived forms: expatiated, expatiates, expatiating

See also: expatiation

Type of: clarify, clear up, elucidate