What does expound mean?
Expound is a formal verb meaning to explain, present, or interpret something systematically and in detail. A lecturer might expound a theory, a critic might expound on the themes of a novel, and a cleric might expound the meaning of a sacred text. The word implies more than a brief account: to expound is to unfold an idea thoroughly, often at length, making it a staple of academic, legal, religious, and philosophical discourse. It derives from the Latin exponere, 'to set forth,' the same root that produced 'exponent' and 'exposition.' In modern usage expound commonly appears with the prepositions 'on' or 'upon,' as in 'expounded on his views.' Because it can suggest exhaustive — even slightly pedantic — explanation, it sometimes carries a hint of formality or long-windedness. For writers seeking a precise, elevated alternative to 'explain' when depth and detail are involved, expound remains a valuable and expressive choice.
verbTo explain or set forth something in detail, typically by presenting it systematically and at length; to interpret or explicate a text, theory, or idea.
- To explain or present something in detail (e.g., 'he expounded his views on economics').
- To interpret or explicate a text or passage (e.g., 'scholars expounding scripture').
"The professor paused to expound his theory before an audience of skeptical colleagues."
"During the seminar, she expounded her argument with unusual clarity and rigor."
"The rabbi would expound on the meaning of the parable each Sabbath morning."
Expound comes from the same Latin verb that gave us 'exponent' — so when you expound an idea, you're literally putting it out there, just like the math term suggests.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of expound
Expound descends from the Latin verb exponere, formed from ex- ('out') and ponere ('to put, place'), literally meaning 'to set forth' or 'to put out.' It entered Middle English through Old French espondre around the thirteenth century, initially in the sense of interpreting scripture or explaining doctrine. English later borrowed related forms directly from Latin, giving us exponent and exposition, which share expound's core notion of laying something out for understanding. Cognates from the same root include expose and the verb posit.
Related word forms
How expound is actually used
Expound is formal and somewhat literary in register; it rarely appears in casual conversation. It is frequently followed by the prepositions 'on' or 'upon' when the object of explanation is introduced later ('expounded on the topic'), though it can also take a direct object ('expounded his philosophy'). The word carries a connotation of thoroughness and sometimes verbosity — someone who expounds at length may be seen as didactic.
Easily confused with expound
Espouse means to adopt or support a cause or belief, while expound means to explain or set forth something in detail.