Gang up is a term used to describe when a GROUP of people come together to oppose or confront someone or something. The crossword solutions for this term include ASSOCIATE (9 letters), COLLECT (7 letters), UNITE (5 letters), GROUP (5 letters), ASSEMBLE (8 letters), GATHER (6 letters), CONGREGATE (10 letters), TEAM (4 letters), MERGE (5 letters), JOIN (4 letters), and unites to oppose (13 letters). All of these words can be used to describe the act of coming together as a GROUP to oppose or confront someone or something.