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

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

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

Encyclopedia: Ratting