What does it mean to 'descant' on a topic?

To 'descant' on a topic means to discuss it at length or in detail, often elaborating on it with commentary or analysis. The term derives from the musical context where it refers to adding a melody above a simple tune. In a conversational or academic setting, to 'descant' signifies that the speaker is providing a more complex or enriched perspective on a subject, engaging deeply with the material rather than merely touching on it or glossing over surface details.

This reflects a certain depth of knowledge and a desire to explore various aspects of the topic, often with enthusiasm or authority. Thus, discussing a topic at length aligns perfectly with the meaning of 'descant.'