noun / verb

fink

To betray someone's trust or loyalty.

A jewelry thief finks on his accomplice to the authorities.

A compact two-panel scene shows a participant in a jewelry theft turning informer against his own accomplice.

Etymology

Fink was used for an objectionable person, especially an informer or strikebreaker. The verb developed from that person label, meaning to inform against someone or otherwise betray loyalty.

More examples

Please don't fink on me for leaving work early.
He promises to help, then finks out at the last minute.
They call him a fink for telling the police.

Forms

fink · finks · finked · finking

Similar words

snitch: Snitch emphasizes reporting wrongdoing rather than failing to keep commitments.
betray: Betray covers broader breaches of trust and is less slangy.