The term 'bind up' can be expressed in two different ways: TIE (3 letters) and ENLACE (6 letters). To 'bind up' something means to fasten it securely with a rope, cord, or band. This phrase is often used to describe the act of tying together two objects, such as a bundle of sticks or a package. It can also be used to refer to the act of binding a book or other document with a cover or binding material. In either case, the purpose is to keep the object secure and prevent it from coming apart.