Expound is defined as to explain further or in more detail.(verb)
An example of expound is someone explaining the meaning of evolution to another.
See expound in Webster's New World College Dictionary
Origin: ME expounden < OFr expondre < L exponere, to put forth, expound < ex-, out + ponere, to put: see position
See expound in American Heritage Dictionary 4
verb ex·pound·ed, ex·pound·ing, ex·pounds verb, transitive
Origin: Middle English expounden
Origin: , from Anglo-Norman espoundre
Origin: , from Latin expōnere
Origin: : ex-, ex-
Origin: + pōnere, to place; see apo- in Indo-European roots.
Learn more about expound