To turn away from a prescribed course of action or conduct
To turn aside, especially from the main subject in writing or speaking
He let the conversation digress into endless discussions about "character."
Let me digress a bit to let the ink dry.
In order to disillusion anyone who may think that my position was a sinecure, I shall now digress.
Kids often digress when out from under parental control.
I need to digress for a moment here.