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Related to rattle on: Simon Rattle
To speak tediously and at great length (about something). He just kept rattling on about literary metaphors and imagery. I didn't know what he was talking about! I caught myself starting to fall asleep while the professor rattled on.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
rattle on (about someone or something)
Fig. to talk endlessly about someone or something. Martin talked incessantly. He would rattle on about any topic whenever he could trap an unfortunate listener.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To talk continuously about something, especially to others not as interested in the subject as the speaker is: They kept rattling on about how much fun they had at the party, but I didn't really care.
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.