To lay open; to expose to view; to examine.

To lay open the meaning of; to explain; to clear of obscurity; to interpret; as, to expound a text of Scripture, a law, a word, a meaning, or a riddle.

(ek· spound) is to "explain" or "talk about."

add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing; "She elaborated on the main ideas in her dissertation"

state; "set forth one's reasons"