expound

UK: /ɪkˈspaʊnd/ US: /ɪkˈspaʊnd/ ,(ik spound′)

WordReference Random House Learner's Dictionary of American English © 2025

ex•pound /ɪkˈspaʊnd/   v. 

1. to make a detailed statement (about): [~ + object]
   to expound theories.
   [~ + on + object]
   expounded on a favorite theory.

See -pon-.

WordReference Random House Unabridged Dictionary of American English © 2025

ex•pound  (ik spound′), v.t. 

1. to set forth or state in detail:
   to expound theories.
2. to explain;
   interpret.

v.i. 

3. to make a detailed statement (often fol. by on).

• Latin expōnere to put out, set forth, explain, equivalent. to ex- ex-¹ + pōnere to put
• Old French espondre
• Middle English expounen, expounden 1250–1300

ex•pound′er, n. 
Synonyms

• 2. See explain. 

Collins Concise English Dictionary © HarperCollins Publishers::

expound / ɪkˈspaʊnd/ verb

1. when intr, followed by on or about: to explain or set forth (an argument, theory, etc) in detail

Etymology: 13th Century: from Old French espondre, from Latin expōnere to set forth, from pōnere to put

exˈpounder noun