verb

leave the main subject temporarily in speech or writing.

I have digressed a little from my original plan

deviate,go off at a tangent,diverge,turn aside,turn away,depart,drift,stray,ramble,wander,meander,maunder,get off the subject,stray from the subject,stray from the point,deviate from the topic,get sidetracked,lose the thread,divagate