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1. Someone acting as an informer or decoy for the police
   - snitch [informal], snitcher [informal], stoolpigeon [informal], stool pigeon [informal], stoolie [N. Amer, informal], sneak [informal], canary [N. Amer], snout [Brit, informal], grass [Brit, informal]

1. Take the place of work of someone on strike
   - scab, rat [informal], blackleg [Brit]
    
2. Admit to the truth, particularly in the context of sins or crimes committed
   - confess, squeal

Derived forms: finked, finking, finks

Type of: acknowledge, admit, betrayer, blabber [informal], do work, informer, rat [informal], squealer, work

Encyclopedia: Fink, Richard