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1. Lie in wait, lie in ambush, behave in a sneaky and secretive manner
   - skulk
    
2. Spend time in one place doing little or wasting time
   "The high school students like to lurk in the Central Square";
   - loiter, lounge, footle [informal], lollygag [N. Amer, informal], loaf [informal], lallygag [N. Amer, informal], hang around, mess about, tarry, linger, mill about, mill around, dilly-dally [informal], dillydally [informal], mooch [Brit, informal]
    
3. Wait in hiding to attack
   - ambush, scupper [informal], bushwhack [N. Amer], waylay, ambuscade [archaic], lie in wait
    
4. To monitor a web forum or similar without making your presence pubilc
    
5. (internet) view an internet forum without contributing anything

Derived forms: lurked, lurks, lurking

Type of: be, conceal, hide, monitor, supervise, wait, watchdog

Encyclopedia: Lurk