go off on a tangent
US /ɡoʊ ɔf ɑn ə ˈtæn.dʒənt/
UK /ɡoʊ ɔf ɑn ə ˈtæn.dʒənt/

成語
1.
跑題, 離題
to suddenly start talking or thinking about a different subject from the one you were originally discussing
範例:
•
The professor tends to go off on a tangent during his lectures, making them hard to follow.
教授在講座中經常跑題,讓人很難跟上。
•
We were discussing the budget, but then he suddenly went off on a tangent about his vacation plans.
我們正在討論預算,但他突然跑題談起了他的度假計劃。
在 Lingoland 學習這個單詞