Go (off) on a tangent
March 13, 2019
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12/3/19 Go (off) on a tangent
To begin addressing or discussing a topic or topics not relevant to the main discussion, or to suddenly start talking about a completely new subject.
Example:
It’s hard to get a firm decision out of him – he’s always going off on a tangent.
Also, in British English: go/fly off at a tangent.
