Other forms: expounded, expounding, expounds
To expound is to set out an idea in careful detail. Expound the theory, expound at length, expound on the subject.
It is faintly heavy, since expounding at length is what somebody does when nobody asked. It is a relative of expose and of exponent, all from the Latin for putting out.
1verbexpoundTo set out an idea in careful detail.
“The professor expounded her theory of language for over two hours.”
expound is an explaining.
Latin exponere means to put out or set forth; expose is a doublet.
Proto-Indo-European
*tḱey-
Latin
expono
Old French
espondre
Middle English
expounden
English, today
expound
From Middle English expounden, from Old French espondre, from Latin expono. a doublet of expone and expose.
Etymology from Wiktionary, CC BY-SA