Meaning

verb lie in wait, lie in ambush, behave in a sneaky and secretive manner

verb be about

verb wait in hiding to attack

originFrom Middle English lurken, from Old Norse *lúrka, possibly from Proto-Germanic *lūrukōną (“to be lying in wait, lurk”), equivalent to lour + -k (frequentative suffix). Cognate with Norwegian Nynorsk lurka (“to sneak away, go slowly”), dialectal Swedish lurka (“to dawdle, be slow in one's work”), Saterland Frisian lüürkje (“to look secretly, spy”), West Frisian luorkje (“to lurk”), Middle Low…

Etymology from Wiktionary, CC BY-SA 3.0