The word "unhitch" means to detach or unfasten something that is hooked or connected to something else. The antonyms for this word are "attach," "fasten," "connect," "link," "couple," or "join." These words represent the opposite of unhitch and mean to connect two things together, making them one unit. For instance, attaching a trailer to a car means joining them together, while unhitching means detaching or separating them. The opposite of unhitch is common in situations where a secure join of two objects is necessary, and it is essential to have a solid connection as it guarantees safety and functionality.