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go off on a tangent
go off on a tangent
Fig. to pursue a somewhat related or irrelevant course while neglecting the main subject. Don't go off on a tangent. Stick to your job. Just as we started talking, Henry went off on a tangent about the high cost of living.
go off on a tangent
(British, American & Australian) also go off at a tangent (British) to suddenly start talking about a different subject We were talking about property prices and you went off on a tangent.