go off on (something)(redirected from gone off on something)
go off on (something)
To begin some lengthy, fervent, or animated speech. Tom started going off on a tangent about his time in Peru. Sorry for going off on a rant like that. It's just an issue that I care about deeply.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
go off on someone
Sl. to berate someone. Don't go off on me! I'm not the cause of your problems! The teacher went off on poor little Harry.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.