If a part of speech or writing breaks the theme, it is called ....

• Digression: (অবান্তরতা)- If a part of speech or writing breaks the theme it is called digression.- The action of moving away from the main subject you are writing or talking about and writing or talking about something else.- মূল প্রসঙ্গ থেকে বিচ্যুতি; অপ্রাসঙ্গিকতা অর্থাৎ মূল বিষয়বস্তু বা থিম থেকে সরে যাওয়া।- A temporary departure from one subject to another more or less distantly related topic before the discussion of the first subject is resumed.- A valuable technique in the art of storytelling, digression is also employed in many kinds of non-fictional writing and oratory.Source: Website Lecture and Oxford Referrence.