go off on one
verb
Definitions
To launch into an animated diatribe, or passionate description or explanation of something.
Example: I barely mentioned the band's name before he went off on one about how commercial the top forty is these days.
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Definitions
To launch into an animated diatribe, or passionate description or explanation of something.
Example: I barely mentioned the band's name before he went off on one about how commercial the top forty is these days.