Definition "gang" in Collins English Dictionary & Thesaurus, spelling "gang"

gang (gangs plural & 3rd person present) (ganging present participle) (ganged past tense & past participle )

1 n-count A gang is a group of people, especially young people, who go around together and often deliberately cause trouble.
oft N of n
During the fight with a rival gang he lashed out with his flick knife..., Gang members were behind a lot of the violence..., He was attacked by a gang of youths.

2 n-count A gang is a group of criminals who work together to commit crimes.
Police were hunting for a gang who had allegedly stolen fifty-five cars., ...an underworld gang., ...a gang of masked robbers.

3 n-sing The gang is a group of friends who frequently meet.
INFORMAL usu the N
Come on over, we've got lots of the old gang here.

4  n-count A gang is a group of workers who do physical work together.
oft N of n
...a gang of labourers.  gang up  phrasal verb If people gang up on someone, they unite against them for a particular reason, for example in a fight or argument.
INFORMAL Harrison complained that his colleagues ganged up on him...  V P on n
All the other parties ganged up to keep them out of power...  V P to-inf
All the girls in my class seemed to gang up against me.  V P against n