Fink and Grass
Fink verb - To give information (as to the authorities) about another's improper or unlawful activities.
Usage example: we never would have been caught if he hadn't finked on us
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Synonyms for Fink
Grass and fink are semantically related. in British slang topic. In some cases you can use "Grass" instead the word "Fink" as a verb or a noun.
Nearby Word: finking
Google Ngram Viewer shows how "fink" and "grass" have occurred on timeline