The antonyms for the word "put alongside" are separate, disunite, divorce, and detach. These antonyms suggest the opposite of combining or placing things or people together. Separate means to divide or keep apart, while disunite refers to breaking a unity or connection. Divorce means to separate or disconnect formally, especially in a legal context, while detach means to remove from something or someone. These antonyms are useful when expressing the opposite of combining or putting things together, such as when discussing the disconnection or difference between two ideas, concepts, or objects.