Cleft to is an expression used to describe something that has been split or divided. Antonyms for cleft to might include words like united, joined, or whole. These words suggest an opposite meaning to the concept of division, instead focusing on ideas of cohesion and unity. Other antonyms for cleft to might include words like intact, unbroken, or seamless, all of which suggest a sense of completeness or wholeness. Using these antonyms can help to convey a different tone or meaning in your writing, and can add depth and complexity to your language.