Definitions
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noun 
  1. In scientific usage, any of about 56 different species of small, omnivorous rodent, rodents belonging to the genus Rattus.
  2. (colloquial) A term indiscriminately applied to numerous members of several rodent families (e.g. voles and mice) having bodies longer than about 12 cm, or 5 inches.
  3. A person who is known for betrayal; a traitor.
What a , leaving us stranded here!
    • 1883, w:Robert Louis Stevenson, Robert Louis Stevenson, w:Treasure Island, Treasure Island
    • : He"s more a man than any pair of rats of you in this here house...
      1. A promiscuous person - often a young female - who attends sporting and other entertainment events, primarily to seek sexual liaisons with athletes, entertainers and/or others traveling with them.
verb (rat, t, ed)
  1. (context, usually with "on" or "out") to betray someone and tell their secret to an authority or an enemy; to turn someone in.
He ratted on his coworker.
He is going to us out!
  1. (context, of a dog, etc.) To kill rats.

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