IdiomDaily LifeEnglish

go off on a tangent

Meaning: To wander away from the subject being discussed.

Example: “The lecture on bees went off on a tangent about his holiday in Crete.”

Origin: In geometry a tangent touches a curve at one point and then heads off in its own direction. The figurative use for a speaker who leaves the topic is found from the 18th century.

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