go off on a tangent

idiom

Definition of go off on a tangent

: to start talking about something that is only slightly or indirectly related to the original subject She went off on a tangent about what happened to her last summer.

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“Go off on a tangent.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/go%20off%20on%20a%20tangent. Accessed 1 Dec. 2020.

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Britannica English: Translation of go off on a tangent for Arabic Speakers

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