The Collaborative International Dictionary of English v.0.48:

Blench \Blench\, v. t.
   1. To baffle; to disconcert; to turn away; -- also, to
      obstruct; to hinder. [Obs.]
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            Ye should have somewhat blenched him therewith, yet
            he might and would of likelihood have gone further.
                                                  --Sir T. More.
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   2. To draw back from; to deny from fear. [Obs.]
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            He now blenched what before he affirmed. --Evelyn.
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The Collaborative International Dictionary of English v.0.48:

Blench \Blench\, v. i. [imp. & p. p. Blenched; p. pr. & vb. n.
   Blenching.] [OE. blenchen to blench, elude, deceive, AS.
   blencan to deceive; akin to Icel. blekkja to impose upon.
   Prop. a causative of blink to make to wink, to deceive. See
   Blink, and cf. 3d Blanch.]
   1. To shrink; to start back; to draw back, from lack of
      courage or resolution; to flinch; to quail.
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            Blench not at thy chosen lot.         --Bryant.
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            This painful, heroic task he undertook, and never
            blenched from its fulfillment.        --Jeffrey.
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   2. To fly off; to turn aside. [Obs.]
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            Though sometimes you do blench from this to that.
                                                  --Shak.
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The Collaborative International Dictionary of English v.0.48:

Blench \Blench\, n.
   A looking aside or askance. [Obs.]
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         These blenches gave my heart another youth. --Shak.
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The Collaborative International Dictionary of English v.0.48:

Blench \Blench\, v. i. & t. [See 1st Blanch.]
   To grow or make pale. --Barbour.
   [1913 Webster]

WordNet (r) 3.0 (2006):

blench
    v 1: turn pale, as if in fear [syn: pale, blanch, blench]

Moby Thesaurus II by Grady Ward, 1.0:

72 Moby Thesaurus words for "blench":
   ache, agonize, ail, anguish, avoid, blanch, bleach, blink, boggle,
   cringe, decolor, decolorize, demur, dodge, draw back, duck, evade,
   fade, fall back, 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, quail, recoil, reel back, retreat,
   scruple, sheer off, shoot, shrink, shrink back, shy, shy at,
   sidestep, smart, squinch, start, start aside, start back, stick at,
   stickle, strain, suffer, swerve, thrill, throb, tingle, turn aside,
   twinge, twitch, waver, weasel, weasel out, white, wince, writhe