to corbel out

from The Collaborative International Dictionary of English v.0.48

Corbel \Cor"bel\, v. t.
   To furnish with a corbel or corbels; to support by a corbel;
   to make in the form of a corbel.
   [1913 Webster]

   {To corbel out}, to furnish with a corbel of courses, each
      projecting beyond the one next below it.
      [1913 Webster]