Definition of "expound"

expound

/ɪkˈspaʊnd/

verb
third-person singular simple present expounds, present participle expounding, simple past and past participle expounded
1. (transitive) To set out the meaning of; to explain or discuss at length
  Quotations
  “ […] Some day, when you are tired of London, come down to Treadley, and expound to me your philosophy of pleasure over some admirable Burgundy I am fortunate enough to possess.”
  1891, Oscar Wilde, chapter III, in The Picture of Dorian Gray, London, New York, N.Y., Melbourne, Vic.: Ward Lock & Co., pages 63–64
2. (intransitive, with on or upon) To make a statement, especially at length.
  Quotations
  Fowler was also interested in metallurgy and the use of new materials that could withstand greater stresses, something he expounded on when giving his presidential address to the new Institution of Mechanical Engineers in 1927.
  2021 December 29, Stephen Roberts, “Stories and facts behind railway plaques: Evesham (1870)”, in RAIL, number 947, page 59