Definitions from Wiktionary (Rat fink)
▸ noun: Alternative form of ratfink. [An informer or spy; a traitor.]
▸ verb: Alternative form of ratfink. [(transitive) To inform on; to betray.]
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▸ noun: Alternative form of ratfink. [An informer or spy; a traitor.]
▸ verb: Alternative form of ratfink. [(transitive) To inform on; to betray.]
Similar:
rat-fink,
fibbie,
rat trap,
tell-tale-tit,
lab-rat,
fatcat,
blab-tongue,
bushrat,
code talker,
frienemy,
more...
Opposite:
▸ Words similar to rat fink
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▸ Invented words related to rat fink