The Collaborative International Dictionary of English v.0.48:

Skulk \Skulk\, v. i. [imp. & p. p. Skulked; p. pr. & vb. n.
   Skulking.] [Of Scand. origin; cf. Dan. skulke to spare or
   save one's self, to play the truant, Sw. skolka to be at
   leisure, to shirk, Icel. skolla. Cf. Scowl.]
   To hide, or get out of the way, in a sneaking manner; to lie
   close, or to move in a furtive way; to lurk. "Want skulks in
   holes and crevices." --W. C. Bryant.
   [1913 Webster]

         Discovered and defeated of your prey,
         You skulked behind the fence, and sneaked away.
                                                  --Dryden.
   [1913 Webster]