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drop the topic
Stop discussing this subject at once. Yes, I was late today—can we just drop the topic now? I don't want to talk about my ex anymore! Drop the topic already!
Introducing, addressing, or discussing things not relevant to or concerned with the subject at hand. Sometimes hyphenated (always if used immediately before a noun). Make sure you don't go off topic during your lecture, or you'll just confuse your students. This is off-topic a bit, but what do you think about the recent economic trend in the Asian markets? My father always includes this off-topic remarks whenever he tells a story, and it just drags the whole thing out for what feels like an eternity.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
not on the topic of discussion; far from the general subject of a discussion; not part of the purpose of a particular communication channel, such as an Internet newsgroup. (*Typically: be ~; get ~; get someone ~.) The boys in the back of the room just love to get the teacher off topic.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.