ex·pound

[ik-spound]
verb (used with object)
1.
to set forth or state in detail: to expound theories.
2.
to explain; interpret.
verb (used without object)
3.
to make a detailed statement (often followed by on ).

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

ex·pound·er, noun
pre·ex·pound, verb (used with object)
un·ex·pound·ed, adjective


2. See explain.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
expound (ɪkˈspaʊnd) [Click for IPA pronunciation guide]
 
vb (when intr, foll by on or about)
to explain or set forth (an argument, theory, etc) in detail: to expound on one's theories; he expounded his reasoning
 
[C13: from Old French espondre, from Latin expōnere to set forth, from pōnere to put]
 
ex'pounder
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

expound
c.1300, from O.Fr. expondre, from L. exponere "put forth, explain," from ex- "forth" + ponere "to put, place" (see position); with intrusive -d. Related: Expounded; expounding.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It's the one when the university comes together to hear a great intellect
  expound on a topic of lasting importance.
We need not expound on this doctrine in great detail, as it plainly does not
  apply here.
Asked to expound, he shakes his head.
Those who apply the rule to particular cases, must of necessity expound and
  interpret that rule.
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