expound vs flesh out

expound and flesh out both are verbs.

Word	Noun	Adjective	Verb	Adverb
expound	No	No	Yes	No
flesh out	No	No	Yes	No

As verbs, expound and flesh out are synonyms defined as:

expound and flesh out: add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing

Other synonyms of expound include dilate, elaborate, enlarge, expand, expatiate, exposit, lucubrate.

As verbs, flesh out is a hypernym of expound; that is, flesh out is a word with a broader meaning than expound:

expound: state
flesh out: add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing

Other hypernyms of expound include dilate, elaborate, enlarge, expand, expatiate, exposit, expound, lucubrate.

expound (verb)	flesh out (verb)
add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing	become round, plump, or shapely
state	add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
	make fat or plump