descant

1. (intransitive) To discuss at length.Examples: "but shun the establishment of a bachelor who has hung a pendulum between temptation and prudence till the age of———but of all subjects, age is the one on which it is most invidious to descant."; "“… This is a surprise attack, and I’d no wish that the garrison, forewarned, should escape. I am sure, Lord Stranleigh, that he has been descanting on the distraction of the woods and the camp, or perhaps the metropolitan dissipation of Philadelphia, …”"; "Involving some interesting, intellectual trips, she was descanting lightly to right and left."intransitive

2. (intransitive, music) To sing or play a descant.intransitive