The phrase "to sign over" means to transfer ownership or rights from one person or entity to another by signing a document. This can be done through a legal process, such as when someone sells their house and signs over the deed to the new owner, or it can happen informally, like when a friend borrows your car keys and you sign them over temporarily. The act of "signing over" involves putting one's name on a document that transfers ownership or rights to another person or entity.