Splitup, which means to separate or divide, has numerous antonyms. The opposite of splitting up could be bringing together, combining, joining, merging, uniting or reconciling. These words suggest a process of moving towards each other or collaborating as opposed to separating. They also imply building stronger relationships and partnerships instead of breaking them apart. For instance, a couple that formerly separated could reconcile and come together again. Similarly, businesses can merge to form a larger company, or allies can unite to form a stronger defence against a common enemy. In summary, antonyms for splitup provide the opposite meaning, and the context in which they are used should be considered.