The Collaborative International Dictionary of English v.0.48:

Hunch \Hunch\, n. [Perh. akin to huckle; cf. hump, hunch, bunch,
   hunk.]
   1. A hump; a protuberance.
      [1913 Webster]

   2. A lump; a thick piece; as, a hunch of bread.
      [1913 Webster]

   3. A push or thrust, as with the elbow.
      [1913 Webster]

   4. A strong, intuitive impression that something will happen;
      -- said to be from the gambler's superstition that it
      brings luck to touch the hump of a hunchback. [Colloq. or
      Slang] "Get a hunch, bet a bunch."

   Syn: presentiment, premonition. [Webster 1913 Suppl. +PJC]

The Collaborative International Dictionary of English v.0.48:

Hunch \Hunch\, v. t. [imp. & p. p. Hunched; p. pr. & vb. n.
   Hunching.]
   1. To push or jostle with the elbow; to push or thrust
      suddenly.
      [1913 Webster]

   2. To thrust out a hump or protuberance; to crook, as the
      back. --Dryden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hunch
    n 1: an impression that something might be the case; "he had an
         intuition that something had gone wrong" [syn: intuition,
         hunch, suspicion]
    2: the act of bending yourself into a humped position
    v 1: round one's back by bending forward and drawing the
         shoulders forward [syn: hunch, hump, hunch forward,
         hunch over]