Idiom (UK), see go off on one. To launch into a rant or lengthy discussion about some pet subject.
Might be derived from "going off on a tangent", but has more of a connotation of annoyance.
Might be derived from "going off on a tangent", but has more of a connotation of annoyance.
by Cedders February 27, 2011
by Manson April 27, 2005