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Verb: expatiate  ik'spey-shee,eyt
  1. Describe and explain in detail
    "She expatiated on the main ideas in her dissertation";
    - elaborate, lucubrate [archaic], exposit, enlarge, flesh out, expand, expound, dilate

Derived forms: expatiated, expatiates, expatiating

Type of: clarify, clear up, elucidate