- v. 详述；细说；漫游
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"
- His deep knowledge of the historical background enabled him to expatiate upon the significance of the movement.
- The chairman expatiated for two hours on his plans for the company.
Winter-flies..crawl out..to expatiate in the sun.出自： J. R. Lowell