Antonyms for the phrase "setting side by side" could include: separating, disjoining, disconnecting, detaching, distancing, and dispersing. These words suggest that the objects or ideas in question are not in close proximity to one another, but are instead spread apart or kept apart intentionally. Other antonyms could include: isolating, compartmentalizing, segregating, or categorizing. These words imply that the objects or ideas are being treated as distinct and separate entities that do not necessarily have any relationship to one another. Whether used literally or figuratively, antonyms for "setting side by side" can help to convey a sense of distance, differentiation, or independence.