Expatiate (verb)

To speak or write at length or in great detail; to elaborate; to discourse.

Origin:

Expatiate is derived from the latin word expatiatus, meaning "to wander" or "to speak at length".

Examples:

1. The speaker expatiated on the history of the city.
2. She expatiated on the benefits of the new policy.
3. He expatiated his ideas on the future of technology.
4. The author expatiated the plot of the novel in great detail.
5. He expatiated on his theories for hours.