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fink (n.)

1902, of uncertain origin, possibly from German Fink "a frivolous or dissolute person," originally "a finch" (see finch); the German word also had a sense of "informer" (compare stool pigeon). The other theory traces it to Pinks, short for Pinkerton agents, the private police force hired to break up the 1892 Homestead strike. As a verb, 1925 in American English slang. Related: Finked; finking.

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Definitions of fink from WordNet
1
fink (v.)
take the place of work of someone on strike;
Synonyms: scab / rat / blackleg
fink (v.)
confess to a punishable or reprehensible deed, usually under pressure;
Synonyms: confess / squeal
2
fink (n.)
someone acting as an informer or decoy for the police;
Synonyms: snitch / snitcher / stoolpigeon / stool pigeon / stoolie / sneak / sneaker / canary
From wordnet.princeton.edu