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