The term APPLICATION LIP is a job description for a LINER, which is a five-letter word. A LINER is a person who applies a thin layer of material to the surface of an object. This material can be anything from paint to glue to wax. The purpose of this layer is to protect the object from wear and tear, or to give it a certain look or feel. Liners are often used in the automotive and construction industries, as well as in the manufacturing of furniture and other products.