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Meaning:
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an animal like, but larger than, a mouse; a person who deserts a cause that he or she thinks is about to fail

informer

betrayer blabbermouth canary double-crosser fink informant sneak snitch source squealer stoolie tattler tattletale turncoat whistle-blower backstabber deep throat stool pigeon
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Cases of word usage

1) one of the long, stiff hairs growing near the mouth of a cat, rat etc (whisker)

RAT as in Wiktionary
RAT as in Wikipedia