The phrase "are one side" implies that something is not balanced or equal. Therefore, antonyms for this phrase could include "are both sides," "are equal," "are balanced," "are even," or "are symmetric." These antonyms suggest a sense of fairness, equality, and harmony, which is the opposite of "are one side." By using antonyms to describe a situation, we can provide a clearer picture of what is missing or what needs improvement. This helps us to communicate effectively and make positive changes towards a more equitable and balanced world.