What is the meaning of expounding?

noun

• A systematic interpretation or explanation (usually written) of a specific topic.
  • synonyms: exposition

verb

• Add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing.
  • usage: "She elaborated on the main ideas in her dissertation"
  • synonyms: elaborate, lucubrate, expatiate, exposit, enlarge, flesh out, expand, expound, dilate
• State.
  • usage: "set forth one's reasons"
  • synonyms: set forth, expound, exposit