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1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Setback \Set"back`\ (s[e^]t"b[a^]k`), n.
      1. (Arch.) Offset, n., 4.
         [1913 Webster]
      2. A backset; a countercurrent; an eddy. [U. S.]
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      3. A reversal of progress in an endeavor; a reverse; a
         backset; a check; a repulse; a relapse. [Colloq. U.S.]
         [1913 Webster]