The Collaborative International Dictionary of English v.0.48:

Wince \Wince\, n.
   The act of one who winces.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wince \Wince\, n. [See Winch.] (Dyeing & Calico Printing)
   A reel used in dyeing, steeping, or washing cloth; a winch.
   It is placed over the division wall between two wince pits so
   as to allow the cloth to descend into either compartment. at
   will.
   [1913 Webster]

   Wince pit, Wince pot, a tank or a pit where cloth in the
      process of dyeing or manufacture is washed, dipped in a
      mordant, or the like.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wince \Wince\, v. i. [imp. & p. p. Winced; p. pr. & vb. n.
   Wincing.] [OE. wincen, winchen, OF. quencir, guenchir,
   guenchier, giencier, guinchier, and (assumed) winchier,
   winchir, to give way, to turn aside, fr. OHG. wankjan,
   wenken, to give way, to waver, fr. winchan to turn aside, to
   nod, akin to E. wink. See Wink.]
   [1913 Webster]
   1. To shrink, as from a blow, or from pain; to flinch; to
      start back.
      [1913 Webster]

            I will not stir, nor wince, nor speak a word.
                                                  --Shak.
      [1913 Webster]

   2. To kick or flounce when unsteady, or impatient at a rider;
      as, a horse winces.
      [1913 Webster]

WordNet (r) 3.0 (2006):

wince
    n 1: the facial expression of sudden pain
    2: a reflex response to sudden pain [syn: wince, flinch]
    v 1: draw back, as with fear or pain; "she flinched when they
         showed the slaughtering of the calf" [syn: flinch,
         squinch, funk, cringe, shrink, wince, recoil,
         quail]
    2: make a face indicating disgust or dislike; "She winced when
       she heard his pompous speech"

Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "wince":
   ache, agonize, ail, anguish, avoid, avoidance, blanch, blench,
   blink, boggle, cower, cringe, demur, dodge, draw back, draw in,
   duck, evade, evasion, fade, fall back, fallback, falter, feel pain,
   feel the pangs, fight shy of, flinch, funk, grimace, hang back,
   hang off, have a misery, have qualms, hesitate, hold off, hurt,
   jib, make bones about, pause, pound, pull back, pull in, pull out,
   pullback, pullout, quail, recoil, reel back, retract, retreat,
   scruple, sheer, sheer off, shoot, shrink, shrink back, shy, shy at,
   sidestep, sidestepping, smart, squinch, start, start aside,
   start back, stick at, stickle, strain, suffer, swerve, thrill,
   throb, tingle, turn, turn aside, twinge, twitch, waver, weasel,
   weasel out, withdraw, writhe