lurk ( P ) Pronunciation Key (lûrk)
intr.v. lurked, lurk·ing, lurks
To lie in wait, as in ambush.
To move furtively; sneak.
To exist unobserved or unsuspected: danger lurking around every bend.


Has any one of you actually tried to lurk? Really, it's something you can't do on your own.
"Hey... I think I'll go lurk in that bush over there"
You can only lurk when someone else designates you a lurker.
"Hey... Forlan's lurking near the goal"

So I don't quite see how lurk can be defined as "To exist unobserved or unsuspected"
Well, enough beating round the bush, that's today's English lesson.