Antonyms for the phrase "gangs up" include terms such as separates, divides, scatters, and disperses. These words suggest the opposite of coming together in a unified manner to form a group with a common goal. Instead, they imply actions that push individuals away from each other or break up a previously cohesive unit. For instance, separating a group of people is the opposite of ganging up on someone. Similarly, dividing a team into smaller factions accomplishes the opposite of gathering a group together. Therefore, the antonyms for "gangs up" emphasize the fragmentation and dispersal of individuals rather than their collective strength.