1. To furnish incriminating evidence to an officer of the law (usually in return for favours)
   "His ratting on his former gang members earned him a reduced sentence";
   - informing

1. Catch rats, especially with dogs
   "The terriers were trained to rat in the barn"
    
2. [informal] Inform on someone to authorities or others in power
   "He ratted on his former gang members";
   - 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
   "He ratted on his gang to get a reduced sentence"
    
4. [informal] Employ scabs or strike breakers in
   "The company ratted the factory during the workers' strike"
    
5. [informal] Take the place of work of someone on strike
   "The company hired rats to keep operations running during the strike";
   - fink [N. Amer, informal], scab, blackleg [Brit]
    
6. [US] Give (hair) the appearance of being fuller by using a rat
   "The stylist ratted her hair to create more volume"

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

Encyclopedia: Ratting