1
                    as in informant
                                                
              
          
                                                      a person who provides information about another's wrongdoing                                       
              
                             who's the sorry rat fink that went squealing to the cops?                         
                
                                                                                                                                
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              2
                    as in bastard
                                                
              
          
                                                      a person whose behavior is offensive to others                                       
              
                             regrets ever doing business with that rat fink, who cheated him out of gobs of money                         
                
                                                                                                                                                                                                                    
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  Merriam-Webster unabridged




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