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]

Moby Thesaurus II by Grady Ward, 1.0:

134 Moby Thesaurus words for "hunch":
   arch, bend, bend back, bilge, blain, bleb, blind guess, blister,
   blob, bold conjecture, boss, bow, bubble, bulb, bulge, bulla, bump,
   bunch, burl, button, cahot, chine, chunk, clod, clump, condyle,
   conjecture, convex, cower, cringe, crook, crouch, curl, curve,
   decurve, deflect, dome, dowel, ear, embow, feeling, flange, flap,
   flex, foreboding, forefeeling, funny feeling, gall, get down,
   gnarl, gob, grovel, guess, handle, hill, hook, huddle, hump,
   hunch down, hunk, impression, incurvate, incurve, inflect,
   intimation, intuition, intuitive impression, jog, joggle, knob,
   knot, knur, knurl, lip, loop, lump, mole, mountain, nevus, nub,
   nubbin, nubble, nugget, papilloma, peg, perhaps, preapprehension,
   prediction, premonition, presage, presagement, presentiment,
   recurve, reflect, reflex, retroflex, rib, ridge, ring, rough guess,
   round, sag, scrouch down, shot, shoulder, speculation, spine,
   squat, stab, stoop, stud, style, surmise, suspicion, swag, sweep,
   tab, tubercle, tubercule, turn, unverified supposition,
   vague feeling, vague idea, vault, verruca, vesicle, wad, wale,
   wallow, wart, welt, welter, wild guess, wind