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
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