( informal ) to join together in a group to hurt, frighten or oppose sb :
At school the older boys ganged up on him and called him names.
( informal ) to join together in a group to hurt, frighten or oppose sb :
At school the older boys ganged up on him and called him names.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005