The antonyms for the word "slicing up" can include combining, assembling, joining, unifying, and merging. When we slice things up, we divide them into smaller parts or pieces. The opposite of this action is to put things together or unite them into a whole. Instead of slicing up a cake into individual servings, we can choose to serve it as a whole cake. Similarly, we can assemble ingredients to create a recipe or join separate businesses to form a partnership. By using antonyms for slicing up, we can emphasize the act of bringing things together rather than tearing them apart.