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.]
1. To shrink, as from a blow, or from pain; to flinch; to
I will not stir, nor wince, nor speak a word.
2. To kick or flounce when unsteady, or impatient at a rider;
as, a horse winces.