«الاستطراد: هو أن يخرج المتكلم من الغرض الذي هو فيه إلى آخر لمناسبة ثم يرجع إلى الغرض الأول»
Istīṭrād is a deliberate move from an original purpose to a second, related topic, followed by a return to the first.
It contains three stages:
1. an established initial theme;
2. a connected digression;
3. a return to the original purpose.
An arbitrary tangent lacks the device’s structure. Both the transition and return must serve a recognizable rhetorical intention.