WordWeb Online

1. [Brit] An informer or spy working for the police
   - copper's nark [Brit]
    
2. A lawman concerned with narcotics violations
   - narc [N. Amer], narcotics agent, narco [N. Amer]

1. Cause annoyance in; disturb, especially by minor irritations
   "Mosquitoes buzzing in my ear really narks me";
   - annoy, rag, get to, bother, get at, irritate, rile, nettle, gravel [US], vex, chafe, devil
    
2. Inform or spy (for the police)

Sounds like: naps, knaps, napnark

Derived forms: narked, narking, narks

Type of: betrayer, blabber, displease, inform, informer, law officer, lawman, peace officer, rat, squealer

Encyclopedia: Nark, Iran