Go off on a tangent

/ɡəʊ ˈɒf ɒn ə ˈtændʒənt/

English idiom, informal. To jump suddenly from one topic to a completely unrelated one.

Draft Not yet checked by a native English speaker.

How do people use Go off on a tangent?

Informal and very common in meetings, classrooms and chats, often as a little apology: “sorry, I’m going off on a tangent”. Americans say “go off on a tangent”, while British speakers also say “go off at a tangent” or “fly off at a tangent”. The noun works by itself as well, so “that was a bit of a tangent” is fine.

Also said go off at a tangent, fly off at a tangent, go on a tangent

Go off on a tangent in real sentences

  • Sorry, I didn’t mean to go off on a tangent.

    Tatoeba, sentence by Bellifer, CC BY 2.0 FR

  • Stick to the subject, don’t go off on a tangent.

    Tatoeba, sentence by earthsophagus, CC BY 2.0 FR

Where does Go off on a tangent come from?

The picture comes from geometry. A tangent is a straight line that touches a curve at a single point and then heads off in its own direction, which is exactly what a rambling speaker does to the original topic. English Wiktionary files the idiom under “fly off at a tangent” and marks “go off on a tangent” as the US form, but it doesn’t give a date for when people first used it about talk.

Mistakes learners make with Go off on a tangent

Learners drop or change the article and say “go off on tangent” or “go off the tangent”. It needs “a”: “on a tangent” in American English, “at a tangent” in British English.

Other English idioms like Go off on a tangent

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