Source : WordNet®

nark
     n 1: an informer or spy working for the police [syn: {copper's
          nark}]
     2: a lawman concerned with narcotics violations [syn: {narc}, {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}, {nettle}, {gravel}, {vex},
           {chafe}, {devil}]
     2: inform or spy (for the police)