Meaning of “go off on a tangent” in the English Dictionary

british dictionary

"go off on a tangent" in British English

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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 Learner’s Dictionary & Thesaurus © Cambridge University Press)