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to go off at a tangent
01
to start talking about something that is in no way related to the topic being discussed
Dialect
British
British
![to [go] off at a tangent definition and meaning](https://cdn.langeek.co/photo/46081/original/?type=jpeg "to [go] off at a tangent definition and meaning")
Example
He always goes off at a tangent when we talk about something serious.
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