fink on

phrasal verb
finked on; finking on; finks on

Definition of fink on

US, informal
: to tell someone about the bad behavior or criminal activity of (another person) The other gang members will kill him if they find out that he finked on them (to the police).

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“Fink on.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fink%20on. Accessed 27 Nov. 2020.

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