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To talk about something for a lengthy amount of time. If Grandpa starts holding forth about the weather, we'll be hearing about the Farmers' Almanac all night.
hold forth (on someone or something)
to speak at great length about someone or something. Sadie held forth on the virtues of home cooking. Sharon is holding forth, and everyone is paying close attention.
Speak in public, especially at great length. For example, Barbara loved to hold forth on the latest discoveries in astronomy. [Second half of 1600s]
hold ˈforth (about/on something)(disapproving) speak for a long time about something in a way that other people might find boring: The politician held forth on the importance of living in a society free from social injustice. ♢ He’s a real bore. He’s always holding forth about something or other.
To talk at great length: The professor held forth on the subject of classical literature for an hour.