Merriam-Webster's Collegiate® Dictionary, 11th Edition
GANG
I. intransitive verb
Etymology: Middle English, from Old English gangan; akin to Lithuanian žengti to stride Date: before 12th century go ,
II. noun
Etymology: Middle English, walking, journey, from Old English; akin to Old English gangan
Date: 15th century
1. a. a set of articles ; outfit , a combination of similar implements or devices arranged for convenience to act together , group : as, a group of persons working together, a group of persons working to unlawful or antisocial ends, a group of persons having informal and usually close social relations ,
III. verb
Date: 1856
transitive verb
1. to assemble or operate simultaneously as a group, to arrange in or produce as a gang, to attack in a gang, intransitive verb to move or act as a gang