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.
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WordNet (r) 3.0 (2006):

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