Longman Dictionary of Contemporary English - gang

~1 n 1 a group of young people who spend time together, and often cause trouble and fight against other groups  (a skinhead gang | members of a notorious gang) + of  (a gang of kids hanging around the mall) 2 a group of criminals who work together  (Several gangs were operating in the area.) + of  (a gang of smugglers) 3 humorous a group of friends, especially young people  (The whole gang will be there next weekend.) 4 a group of workers or prisoners doing physical work together  (- see also chain gang) ~2 v gang up on sb phr v to join together into a group to attack someone or oppose them  (I hate school! They all gang up on me!)