yap, yapped. A binding featuring a cover that overlaps the three edges of both upper and lower covers continuously. The covers are always limp or semi-flexible, and are sometimes fitted with a zipper.
Named after Wm. Yapp a 17thc Bible merchant who designed a limp leather binding for bibles to be carried in the pocket. The Binder Sam. Bagster listed them as “yapp binding” in his catalog and thus a trade term was born.