Definitions from Wiktionary (narc)

▸ noun:  (informal, colloquial, drugs) A police officer or federal agent assigned to or engaging in illegal narcotics control.
▸ verb:  (underwater diving, slang) To suffer from impaired judgment due to nitrogen narcosis (for example, while scuba diving).
▸ noun:  (colloquial, informal) A narcissist.
▸ noun:  (informal, colloquial, drugs) Alternative spelling of nark (“spy”) [(UK, Ireland) A police spy or informer.]
▸ verb:  (informal, colloquial, drugs) Alternative spelling of nark [(transitive, intransitive, slang) To serve or behave as a spy or informer; to tattle.]

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