Webster's Revised Unabridged Dictionary · 1913

Skulk

Skulk , intransitive verb

[Of Scand. origin; compare Danish skulke to spare or save one's self, to play the truant, Swedish skolka to be at leisure, to shirk, Icelandic skolla. Compare 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 , noun

[Compare Icelandic skollr, skolli, a fox, and English skulk, v.i.]

A number of foxes together. — Wright

Skulk , noun

One who, or that which, skulks.

Also: Skulker