资料来源 : Webster's Revised Unabridged Dictionary (1913)

Whipping \Whip"ping\,
   a & n. from {Whip}, v.

   {Whipping post}, a post to which offenders are tied, to be
      legally whipped.

资料来源 : WordNet®

whipping post
     n : post formerly used in public to which offenders are tied to
         be whipped