hold forth

English

(transitive, idiomatic) To extend or offer, propose.
(intransitive, idiomatic) Talk at great length; expatiate; harangue.
- 1913, D. H. Lawrence, Sons and Lovers, chapter 5:
  The girls all liked to hear him talk. They often gathered in a little circle while he sat on a bench, and held forth to them, laughing.
- 1918, W. B. Maxwell, chapter 2, in The Mirror and the Lamp‎^[1]:
  [T]hey did not like him coming round of an evening and drinking weak whisky-and-water while he held forth on railway debentures and corporation loans.

talk at great length