Definition of "hollow-back" []

• An abnormal inward (forward) curvature of the vertebral column (noun)

WordNet. Princeton University. 2010.

• "Instruction begins with pulling, repairing, and the construction of flat-backed casebound notebooks and half- and full-cloth hollow-back bindings."
• "For large trees, a straight-back type of saw is preferable (1a) and for small to medium trees a hollow-back type."
• "Darling and Canning Downs, patches of Peel's Plains, and several remarkable points of the forest hills on that side, fully identifying this hollow-back with the pass discovered last year at the head of"