Fence off Definition 1 of 2Pro Tip 1/3Physical Barrier Emphasizes creating an actual barrier with a fence to separate areas. They fenced off the vegetable patch to keep rabbits out. Pro Tip 2/3Land Ownership Used to identify or claim ownership of a piece of land. The new landowner fenced off fifty acres for a future orchard. Pro Tip 3/3Safety Measure Highlights how fences can protect something from outside threats. The chemical plant fenced off its perimeter for safety.