Source : Webster's Revised Unabridged Dictionary (1913)

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.

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

Skulk \Skulk\, n. [Cf. Icel. skollr, skolli, a fox, and E.
   skulk, v.i.]
   A number of foxes together. --Wright.

Skulk \Skulk\, Skulker \Skulk"er\, n.
   One who, or that which, skulks.

Source : WordNet®

skulk
     v 1: lie in wait, lie in ambush, behave in a sneaky and secretive
          manner [syn: {lurk}]
     2: avoid responsibilities and duties, e.g., by pretending to be
        ill [syn: {malinger}]
     3: move stealthily; "The lonely man skulks down the main street
        all day"