To move away from a group, deviate from the correct course, or go beyond established limits. To become lost. To wander about without a destination or purpose; roam. See Synonyms at wander. To follow a winding course; meander. To deviate from a moral, proper, or right course; err. To become diverted from a subject or train of thought; digress. See Synonyms at swerve. One that has strayed, especially a domestic animal wandering about. Straying or having strayed; wandering or lost: stray cats and dogs. Scattered or separate: a few stray crumbs.