To ride roughshod

from The Collaborative International Dictionary of English v.0.48

Roughshod \Rough"shod\, a.
   Shod with shoes armed with points or calks; as, a roughshod
   horse.
   [1913 Webster]

   {To ride roughshod}, to pursue a course regardless of the
      pain or distress it may cause others.
      [1913 Webster]