rat·ter /ˈrætɚ/
  捕鼠者,叛變者
  Rat·ter n.
  1. One who, or that which, rats, as one who deserts his party.
  2. Anything which catches rats; esp., a dog trained to catch rats; a rat terrier. See Terrier.
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  ratter
       n 1: a disloyal person who betrays or deserts his cause or
            religion or political party or friend etc. [syn: deserter,
             apostate, renegade, turncoat, recreant]
       2: any of several breeds of terrier developed to catch rats
          [syn: rat terrier]