Today’s lesson of colloquial expression
588. to go off on a tangent 脱線する、横道にそれる
- this means to suddenly begin talking about something completely unrelated to what you were previously talking about
1. Halfway through the lecture, the speaker went off on a tangent about dog racing for several minutes. It was kind of strange.
2. Not to go off on a tangent, but have you ever seen that movie where the giant monster attacks New York?