1. (

• rat

) desert one's party or group of friends, for example, for one's personal advantage ;

2. (

• rat ,

) employ scabs or strike breakers in ;

3. (

• fink ,
• scab ,
• rat ,
• blackleg

) take the place of work of someone on strike ;

4. (

• rat ,

) give (hair) the appearance of being fuller by using a rat ;

5. (

• rat

) catch rats, especially with dogs ;

6. (

• denounce ,
• tell_on ,
• betray ,
• give_away ,
• rat ,
• grass ,
• shit ,
• shop ,
• snitch ,
• stag ,

) give away information about somebody; "He told on his classmate who had cheated on the exam" ;