raw·hide /ˈrɔˌhaɪd/
  生皮,生皮鞭(vt.)用生皮鞭抽打(a.)生牛皮的
  Raw·hide n. A cowhide, or coarse riding whip, made of untanned (or raw) hide twisted.
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  rawhide
       n : untanned hide especially of cattle; cut in strips it is used
           for whips and ropes