hold forth
phrasal verb with hold verb uk/həʊld/ us/hoʊld/ held | held
usually disapproving
滔滔不绝地说，发表长篇大论
to talk about a particular subject for a long time, often in a way that other people find boring
She held forth all afternoon about/on government incompetence. 她整个下午都在滔滔不绝地谈论政府的无能。