"lurk" in the verb sense
1. lurk, skulk
lie in wait, lie in ambush, behave in a sneaky and secretive manner
2. loiter, lounge, footle, lollygag, loaf, lallygag, hang around, mess about, tarry, linger, lurk, mill about, mill around
"The high school students like to loiter in the Central Square"
"Who is this man that is hanging around the department?"
3. ambush, scupper, bushwhack, waylay, lurk, ambuscade, lie in wait
wait in hiding to attack
Source: WordNet® (An amazing lexical database of English)
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