rat

Noun

• a pad (usually made of hair) worn as part of a woman's coiffure

• one who reveals confidential information in return for money

• a person who is deemed to be despicable or contemptible
  • 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'
    

• someone who works (or provides workers) during a strike

• any of various long-tailed rodents similar to but larger than a mouse

Verb

• give away information about somebody
  • He told on his classmate who had cheated on the exam
    

• catch rats, especially with dogs

• give (hair) the appearance of being fuller by using a rat

• take the place of work of someone on strike

• employ scabs or strike breakers in

• desert one's party or group of friends, for example, for one's personal advantage

Related words

• Synonyms: 
  informer , betrayer , squealer , blabber , scab , strikebreaker , blackleg , fink