WordWeb Online

1. To furnish incriminating evidence to an officer of the law (usually in return for favours)
   - informing

1. Desert one's party or group of friends, for example, for one's personal advantage
    
2. Employ scabs or strike breakers in
    
3. Take the place of work of someone on strike
   - fink [N. Amer], scab, blackleg [Brit]
    
4. Give (hair) the appearance of being fuller by using a rat
    
5. Catch rats, especially with dogs
    
6. Give away information about somebody
   - denounce, tell on, betray, give away, grass, shop, snitch, stag

See also: ratter

Type of: capture, catch, defect, desert, disclosure, do work, employ, engage, fill out, hire, inform, pad, revealing, revelation, work

Encyclopedia: Rat