"Going fifty fifty" is an idiomatic expression that indicates an equal sharing of resources or responsibility between two parties. The antonyms for this phrase might entail words like "disproportionate," "unequal," "biased," or "one-sided." These terms express the opposite meaning of equitable sharing or equal participation. When one party takes the lead or dominates in a project, enterprise or partnership, the emphasis is on their control or superiority over the other. Similarly, when one party takes more than they give, their actions may appear unfair or even selfish. In contrast, "going fifty fifty" signifies collaboration, mutual trust, and a shared sense of accountability.