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rat fink

NOUN
snake in the grass
Synonyms
WEAK
Pandora's box backstabber creep pitfall rat skunk snake sneak trap villain viper weasel
NOUN
stool pigeon
Synonyms
WEAK
agent provocateur betrayer blabbermouth canary decoy deep throat double-crosser fink informant informer narc nark plant police informer rat shill sneak snitch snitcher source spy squealer stoolie tattler tattletale tipster turncoat weasel whistle-blower

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.