narc
noun
°(slang) A narcotics squad police officer.
°(slang) (alternative spelling of nark) – A person who notifies authorities of illicit activity, betraying someone in the process.
verb
°(slang) (alternative spelling of nark) – to inform authorities of the illicit actions of others that one has knowledge of as an insider.
°(slang) To suffer from impaired judgment due to nitrogen narcosis (e.g. while scuba diving).
synonyms: rat#verb|rat out, tattle