There are various antonyms for the phrase "chum together," which means to spend time with someone in a friendly and sociable way. Some of the antonyms include "separate," "disperse," "scatter," "dissolve," "break up," and "go their separate ways." These words indicate the opposite of gathering or sticking together, implying that the people involved are moving away from each other rather than towards each other. Sometimes, it is necessary to disperse or break up groups, especially in situations where there is conflict or tension. However, when the relationship is positive and healthy, chumming together can bring people closer and foster deep bonds of friendship.