straggle

Short definition from Wiktionary

Verb

1. 1
   To stray, rove, or wander from a normal course and others of its kind.
2. 2
   To act in a disorderly and irregular way.
3. 3
   To move along slowly so as to remain some distance behind the person or people in front.

Noun

1. 1
   An irregular, spread-out group.
2. 2
   An outlier; something that has strayed beyond the normal limits.