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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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Speak in public, especially at great length. For example, Barbara loved to hold forth on the latest discoveries in astronomy. [Second half of 1600s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.
Farlex Partner Idioms Dictionary © Farlex 2017
To talk at great length: The professor held forth on the subject of classical literature for an hour.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.