lose clarity or turn aside especially from the main subject of attention or course of argument in writing, thinking, or speaking
She always digresses when telling a story. Her mind wanders. Don't digress when you give a lecture.
source: WordNet 3.0
wander from a direct or straight course
source: WordNet 3.0
To step or turn aside; to deviate; to swerve; especially, to turn aside from the main subject of attention, or course of argument, in writing or speaking.
