back
1. See: SPINE . 2.
To shape a ridge or shoulder on the sides of the
spine of a text block after sewing. See: BACKING . 3. The main
portion of a HIDE
(1) , obtained by cutting off both sides of
the belly and the head. 4. Boards composed of
plies of different stock, the side of superior
quality being called the "top" and the other side
the "back."
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