Legal Definition of Encumber: To burden property with debt, such as to mortgage or otherwise grant a security interest in property to another | Learn the Legal Definition of Encumber: Understand the legal concept of encumber and how it can impact your property. Discover what encumbrances are, the different types, and why it’s important to have a clear understanding. Protect your assets and make informed decisions as a business owner. Consult with legal professionals for personalized advice