Fence off refers to the act of enclosing an area with barriers, typically made of wood, wire, or similar materials. The antonyms for fence off include open up, unbar, and uncover. Open up refers to removing any barriers, allowing easy access to the enclosed area. Unbar denotes the removal of metal or wooden bars which have been used to create a barrier. Uncover refers to exposing an area that had been previously hidden. These antonyms are related to the opposite of isolation or separation of a particular space or location, thus allowing easy access for people, vehicles, or animals.