The Collaborative International Dictionary of English v.0.48:

Hack \Hack\, n.
   1. A notch; a cut. --Shak.
      [1913 Webster]

   2. An implement for cutting a notch; a large pick used in
      breaking stone.
      [1913 Webster]

   3. A hacking; a catch in speaking; a short, broken cough.
      --Dr. H. More.
      [1913 Webster]

   4. (Football) A kick on the shins, or a cut from a kick. --T.
      Hughes.
      [1913 Webster]

   5. (Computers) A clever computer program or routine within a
      program to accomplish an objective in a non-obvious
      fashion.
      [PJC]

   6. (Computers) A quick and inelegant, though functional
      solution to a programming problem.
      [PJC]

   7. A taxicab. [informal]
      [PJC]

   Hack saw, a handsaw having a narrow blade stretched in an
      iron frame, for cutting metal.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hack saw
    n 1: saw used with one hand for cutting metal [syn: hacksaw,
         hack saw, metal saw]