nark

nark
    n 1: an informer or spy working for the police [syn: {nark},
         {copper's nark}]
    2: a lawman concerned with narcotics violations [syn: {narc},
       {nark}, {narcotics agent}]
    v 1: cause annoyance in; disturb, especially by minor
         irritations; "Mosquitoes buzzing in my ear really bothers
         me"; "It irritates me that she never closes the door after
         she leaves" [syn: {annoy}, {rag}, {get to}, {bother}, {get
         at}, {irritate}, {rile}, {nark}, {nettle}, {gravel}, {vex},
         {chafe}, {devil}]
    2: inform or spy (for the police)
    

nark \nark\ n. [from narcotics.]
   A law enforcement agent specializing in narcotics law
   violations. [slang]
   [PJC]