go off on a tangent Meaning in Cambridge English Dictionary
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Meaning of "go off on a tangent" - English Dictionary

go off on a tangent

(UK also go/fly off at a tangent)
to suddenly start talking or thinking about a completely new subject: It's hard to get a firm decision out of him - he's always going off on a tangent.
(Definition of go off on a tangent from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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