1. Any of various long-tailed rodents similar to but larger than a mouse (synset 102333698)
  2. Someone who works (or provides workers) during a strike (synset 110573883)
  3. A person who is deemed to be despicable or contemptible (synset 110559272)
    "only a rotter would do that"; "kill the rat"; "throw the bum out"; "you cowardly little pukes!"; "the British call a contemptible person a `git'"
  4. One who reveals confidential information in return for money (synset 110225792)
  5. A pad (usually made of hair) worn as part of a woman's coiffure (synset 104062142)
  1. Desert one's party or group of friends, for example, for one's personal advantage (synset 202590560)
  2. Employ scabs or strike breakers in (synset 202418270)
  3. Take the place of work of someone on strike (synset 202418069)
  4. Give (hair) the appearance of being fuller by using a rat (synset 201529923)
  5. Catch rats, especially with dogs (synset 201483271)
  6. Give away information about somebody (synset 200843665)
    "He told on his classmate who had cheated on the exam"

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