expatiate

/ษ›kหˆspeษชสƒษชeษชt/
verb
  1. 1

    To range at large, or without restraint.

  2. 2

    To write or speak at length; to be copious in argument or discussion.

  3. 3

    To expand; to spread; to extend; to diffuse; to broaden.

Source: https://en.wiktionary.org/wiki/expatiate