rabbit back
A text block that has been rounded and backed in
such a manner that, instead of forming the arc of
approximately one-third of a circle, the spine is
peaked in the center and slopes steeply to the
shoulders. The "rabbit back" is generally a result
of improper rounding and backing procedures, too
much swell in the spine because of added bulk of
the sewing thread, or loose sewing. See also: HOG'S BACK (1) . (97 )