Fence out is a term used to describe the act of preventing someone or something from entering a specific area. There are a number of synonyms for fence out that are commonly used. The first synonym is barricade. To barricade something is to block it off or prevent access to it. Barriers can be made of physical objects, like walls or fences, or they can be made of temporary or movable structures. Another synonym for fence out is exclude. When you exclude someone or something, you are preventing them from being a part of a particular activity or group. Exclusion can be a deliberate act, or it can happen unintentionally. A third synonym is deter. When you deter someone or something, you are discouraging them from entering a particular area or from engaging in a particular activity. This can be done through the use of physical barriers or through other means, such as warning signs or verbal warnings.