Meaning of fink in English
Noun
finkEtymology
late 19th century: of unknown origin; perhaps from German, literally ‘finch’, but also a pejorative term. Students started to refer to nonmembers of fraternities as finks, probably by association with the freedom of wild birds as opposed to caged ones. The term was later generalized to denote those not belonging to organizations such as trade unionsDefinitions
1. someone acting as an informer or decoy for the police