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rat

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noun [countable] rat pronunciation in American English /ræt/ 
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singularrat
pluralrats
  1. 1
    an animal like a large mouse with a long tail

    The house was infested with rats.

    diseases spread by rats

    rat poison

  2. 2
    informal someone who is not loyal or who tricks you
    Synonyms and related words for this sense of rat

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