Unpins, a verb that refers to the act of removing a pin or releasing something that is pinned, can be substituted with various synonyms. The first is "unfasten," which is a general term that can be used for other things that need to be unfixed. The next one is "detach," which implies a more forceful breakaway of a pin or fastener. "Unlock" can also be used for things that are secured and require a key or combination to open. "Release" is another way to describe the action of unpins, and it comes with the connotation of setting something free. Lastly, "disengage" is a synonym that gives the impression of a disconnection or untangling.