Fencing off is a common practice followed to restrict access to a certain area. However, there are certain antonyms for fencing off that can be used to describe the opposite action. For instance, 'opening up' is an antonym for fencing off, which means opening an area or allowing more access to it. Another antonym that can be used is 'unfolding', which means opening or unfolding a particular area. In contrast, 'freeing', 'liberating' and 'unblocking' are also some antonyms that can be used to describe the opposite of fencing off. Therefore, depending on the context and situation, antonyms for fencing off can be used to convey a message that is the opposite of restricting access.