The antonyms for the phrase "sticking together" could be "coming apart," "drifting away," or "separating." When two or more entities stick together, it implies that they are connected or united in some way. Therefore, the opposite of sticking together would imply disintegration, separation, or even hostility. In a social or political context, the antonyms of sticking together could mean fragmentation, disunity, or polarization. In personal relationships, the antonyms of sticking together could be distancing, neglect, or abandonment. Whether applied to tangible or intangible entities, the antonyms of sticking together imply a breakdown in the bond that once held them together.