go off on a tangent

US /ɡoʊ ɔf ɑn ə ˈtæn.dʒənt/
UK /ɡoʊ ɔf ɑn ə ˈtæn.dʒənt/
"go off on a tangent" picture
1.

انحرف عن الموضوع, خرج عن السياق

to suddenly start talking or thinking about a different subject from the one you were originally discussing

:
The professor tends to go off on a tangent during his lectures, making them hard to follow.
يميل الأستاذ إلى الانحراف عن الموضوع خلال محاضراته، مما يجعلها صعبة المتابعة.
We were discussing the budget, but then he suddenly went off on a tangent about his vacation plans.
كنا نناقش الميزانية، لكنه فجأة انحرف عن الموضوع وتحدث عن خطط إجازته.