Oxford Dictionary English

expound

verb
verb
BrE BrE//ɪkˈspaʊnd//
; NAmE NAmE//ɪkˈspaʊnd//
[transitive, intransitive] (formal)Verb Forms present simple I / you / we / they expound
BrE BrE//ɪkˈspaʊnd//
; NAmE NAmE//ɪkˈspaʊnd//
 he / she / it expounds
BrE BrE//ɪkˈspaʊndz//
; NAmE NAmE//ɪkˈspaʊndz//
 past simple expounded
BrE BrE//ɪkˈspaʊndɪd//
; NAmE NAmE//ɪkˈspaʊndɪd//
 past participle expounded
BrE BrE//ɪkˈspaʊndɪd//
; NAmE NAmE//ɪkˈspaʊndɪd//
 -ing form expounding
BrE BrE//ɪkˈspaʊndɪŋ//
; NAmE NAmE//ɪkˈspaʊndɪŋ//
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to explain something by talking about it in detail expound something (to somebody) He expounded his views on the subject to me at great length. the theory of language expounded by Chomsky She expounded her theory further in the course of her talk. These ideas were originally expounded by Plato. expound on something We listened as she expounded on the government's new policies. Oxford Collocations DictionaryExpound is used with these nouns as the object: doctrine, idea, view, … See full entry Word OriginMiddle English expoune (in the sense ‘explain (what is difficult)’): from Old French espon-, present tense stem of espondre, from Latin exponere ‘expose, publish, explain’, from ex- ‘out’ + ponere ‘put’. The origin of the final -d (recorded from the Middle English period) is uncertain (compare with compound, propound).
See expound in the Oxford Advanced American Dictionary
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