Use 'expatiate on' in formal writing or discussions, typically in academic or scholarly environments. In her thesis, she expatiates on the implications of social media.
Pro Tip 2/3
Structured Explanation
'Expatiate on' implies a structured, in-depth explanation, not just a casual mention. During the lecture, the professor expatiated on the causes of World War II.
Pro Tip 3/3
Avoid Repetition
When you expatiate on a topic, offer new insights instead of repeating known facts. The speaker expatiated on the study's findings without being repetitive.