The word "decouple" refers to separating two things that were previously connected or dependent on each other. Its antonyms would be words that describe the opposite action, such as "couple" or "connect," meaning to bring two things together. Other antonyms could include "attach," "link," "join," or "integrate." These words all suggest a close relationship and a dependency between the two things being mentioned. However, if we move away from the idea of two things being connected, other antonyms for "decouple" could include words like "isolate," "detach," or "seclude," implying a sense of distance or separateness.