Synonyms for Dilate (same or very similar meaning)
WordNet sense 1 (add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing):
elaborate, enlarge, expand, expatiate, expound, lucubrate, exposit, elaborate, flesh outWordNet sense 2 (become wider):
distendFrom the ODE community, based on WordNetadd/edit