rip·per /ˈrɪpɚ/
  撕裂者
  Rip·ler Rip·per n.  O.E. Law One who brings fish from the seacoast to markets in inland towns. [Obs.]
  But what's the action we are for now ?
  Robbing a ripper of his fish.   --Beau. & Fl.
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  Rip·per n.
  1. One who, or that which, rips; a ripping tool.
  2. A tool for trimming the edges of roofing slates.
  3. Anything huge, extreme, startling, etc. [Slang.]
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  ripper
       n : a murderer who slashes the victims with a knife; "Jack the
           ripper was probably a madman"