a few stray crumbs.
a stray calf.
a stray dog.
Don't digress when you give a lecture.
don't drift from the set course.
her mind wanders.
isolated instances of rebellion.
roving vagabonds.
She always digresses when telling a story.
The cattle roam across the prairie.
The child strayed from the path and her parents lost sight of her.
The gypsies roamed the woods.
the laborers drift from one town to the next.
the wandering Jew.
They rolled from town to town.