di·gres·sion
noun/daɪˈɡreʃn/
/daɪˈɡreʃn/
[countable, uncountable] (formal)- an act of talking about something that is not connected with the main point of what you are saying
离题；偏离主题 - After several digressions, he finally got to the point.
说了几句题外话后，他终于言归正传。
- After several digressions, he finally got to the point.