The Collaborative International Dictionary of English v.0.48:

Dare \Dare\ (d[^a]r), v. i. [imp. Durst (d[^u]rst) or Dared
   (d[^a]rd); p. p. Dared; p. pr. & vb. n. Daring.] [OE. I
   dar, dear, I dare, imp. dorste, durste, AS. ic dear I dare,
   imp. dorste. inf. durran; akin to OS. gidar, gidorsta,
   gidurran, OHG. tar, torsta, turran, Goth. gadar,
   gada['u]rsta, Gr. tharsei^n, tharrei^n, to be bold, tharsy`s
   bold, Skr. Dhrsh to be bold. [root]70.]
   To have adequate or sufficient courage for any purpose; to be
   bold or venturesome; not to be afraid; to venture.
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         I dare do all that may become a man; Who dares do more
         is none.                                 --Shak.
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         Why then did not the ministers use their new law?
         Bacause they durst not, because they could not.
                                                  --Macaulay.
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         Who dared to sully her sweet love with suspicion.
                                                  --Thackeray.
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         The tie of party was stronger than the tie of blood,
         because a partisan was more ready to dare without
         asking why.                              --Jowett
                                                  (Thu?yd.).
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   Note: The present tense, I dare, is really an old past tense,
         so that the third person is he dare, but the form he
         dares is now often used, and will probably displace the
         obsolescent he dare, through grammatically as incorrect
         as he shalls or he cans. --Skeat.
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               The pore dar plede (the poor man dare plead).
                                                  --P. Plowman.
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               You know one dare not discover you. --Dryden.
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               The fellow dares not deceive me.   --Shak.
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               Here boldly spread thy hands, no venom'd weed
               Dares blister them, no slimy snail dare creep.
                                                  --Beau. & Fl.
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   Note: Formerly durst was also used as the present. Sometimes
         the old form dare is found for durst or dared.
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The Collaborative International Dictionary of English v.0.48:

Durst \Durst\, imp.
   of Dare. See Dare, v. i.
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