a rat fink

(American informal)

an extremely unpleasant person, or someone who has given secret information about you to the police If I find the rat fink who informed on me, he won't live long enough to do it again.

Common Names:

Name	Pronounced	Usage
Millie	MIL-ee	English
Hiroto	hee-ṙo-to	Japanese
EugÊNia	-	Portuguese
Eilert	AY-lert (Swedish)	Frisian, Swedish, Norwegian, Danish
Hannie	HAHN-nee	Dutch
Kassia	KA-shə	English (Rare)