rat
noun.
any of various long-tailed rodents similar to but larger than a mouse
noun.
someone who works (or provides workers) during a strike
noun.
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'
noun.
one who reveals confidential information in return for money
noun.
a pad (usually made of hair) worn as part of a woman's coiffure
verb.
desert one's party or group of friends, for example, for one's personal advantage
verb.
employ scabs or strike breakers in
verb.
take the place of work of someone on strike
Synonym: blackleg, fink, scab
verb.
give (hair) the appearance of being fuller by using a rat
verb.
catch rats, especially with dogs
verb.
give away information about somebody
He told on his classmate who had cheated on the exam