Etymology
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lurk (v.)

c. 1300, lurken "to hide, lie hidden," probably from Scandinavian (compare dialectal Norwegian lurka "to sneak away," dialectal Swedish lurka "to be slow in one's work"), perhaps ultimately related to Middle English luren "to frown, lurk" (see lower (v.2)). From late 14c. as "move about secretly;" also "escape observation." Related: Lurked; lurking.

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Definitions of lurk

lurk (v.)
lie in wait, lie in ambush, behave in a sneaky and secretive manner;
Synonyms: skulk
lurk (v.)
be about;
Synonyms: loiter / lounge / footle / lollygag / loaf / lallygag / hang around / mess about / tarry / linger / mill about / mill around
lurk (v.)
wait in hiding to attack;
Synonyms: ambush / scupper / bushwhack / waylay / ambuscade / lie in wait
From wordnet.princeton.edu