The Collaborative International Dictionary of English v.0.48:

Lurcher \Lurch"er\ (l[^u]rch"[~e]r), n. [See Lurch to lurk.]
   1. One that lurches or lies in wait; one who watches to
      pilfer, or to betray or entrap; one who lurks; a lurker; a
      poacher.
      [1913 Webster +PJC]

   2. (Zool.) One of a mongrel breed of dogs said to have been a
      cross between the sheep dog, greyhound, and spaniel. It
      hunts game silently, by scent, and is often used by
      poachers.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lurcher \Lurch"er\, n. [L. lurco, lurcho, a glutton. See 1st
   Lurch.]
   A glutton; a gormandizer. [Obs.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

lurcher
    n 1: someone waiting in concealment [syn: lurker, skulker,
         lurcher]