water rat

  1. any of various rodents that live on the banks of streams and ponds
  2. muskrat

See water rat in American Heritage Dictionary 4

noun
  1. a. Any of various semiaquatic rodents, especially Neofiber alleni, of Florida and southern Georgia, closely related to and resembling the muskrat.
    b. See muskrat.
  2. Slang A petty thief or ruffian who frequents waterfronts.

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