Source : Webster's Revised Unabridged Dictionary (1913)

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}.]
   1. To shrink, as from a blow, or from pain; to flinch; to
      start back.

            I will not stir, nor wince, nor speak a word.
                                                  --Shak.

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

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.

   {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.

Wince \Wince\, n.
   The act of one who winces.

Source : WordNet®

wince
     n 1: the facial expression of sudden pain
     2: a reflex response to sudden pain [syn: {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}, {recoil}, {quail}]
     2: make a face indicating disgust or dislike; "She winced when
        she heard his pompous speech"