Meaning of “expound” - Learner’s Dictionary

expound

verb [ I, T ] us uk /ɪkˈspaʊnd/ formal

to give a detailed explanation of something:

He's always expounding on what's wrong with the world.
She uses her newspaper column to expound / her views on environmental issues.

(Definition of “expound” from the Cambridge Learner’s Dictionary © Cambridge University Press)