Cojoining is a term that refers to the act of bringing two or more items, concepts, or individuals together to form a cohesive whole. However, there are a number of antonyms that can be used to describe the opposite of cojoining. Some of these include separating, dividing, disintegrating, and scattering. These antonyms reflect the idea of breaking apart or undoing something that was previously cojoined. Other antonyms for cojoining might include isolating, alienating, or segregating, all of which suggest a sense of separation or detachment from a larger group or collective. Ultimately, the choice of antonym will depend on the context in which the term is being used, as well as the specific meaning intended.