Etymology
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skulk (v.)

c. 1200, from a Scandinavian source such as Norwegian skulke "to shirk, malinger," Danish skulke "to spare oneself, shirk," Swedish skolka "to shirk, skulk, slink, play truant." Common in Middle English but lacking in 15c.-16c. records; possibly reborrowed 17c. Related: Skulked; skulking; skulkery. Skulker as an old name for the hare is attested from c. 1300. Middle English also had skulkerie "concealment, stealthy behavior or action" c. 1400.

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Definitions of skulk

skulk (v.)
lie in wait, lie in ambush, behave in a sneaky and secretive manner;
Synonyms: lurk
skulk (v.)
avoid responsibilities and duties, e.g., by pretending to be ill;
Synonyms: malinger
skulk (v.)
move stealthily;
The lonely man skulks down the main street all day
From wordnet.princeton.edu