The Collaborative International Dictionary of English v.0.48:

Miscarry \Mis*car"ry\, v. i. [imp. & p. p. Miscarried; p. pr.
   & vb. n. Miscarrying.]
   [1913 Webster]
   1. To carry, or go, wrong; to fail of reaching a destination,
      or fail of the intended effect; to be unsuccessful; to
      suffer defeat.
      [1913 Webster]

            My ships have all miscarried.         --Shak.
      [1913 Webster]

            The cardinal's letters to the pope miscarried.
                                                  --Shak.
      [1913 Webster]

   2. To bring forth young before the time they are viable; to
      have a spontaneous abortion.
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

miscarry
    v 1: be unsuccessful; "Where do today's public schools fail?";
         "The attempt to rescue the hostages failed miserably" [syn:
         fail, go wrong, miscarry] [ant: bring home the
         bacon, come through, deliver the goods, succeed,
         win]
    2: suffer a miscarriage [ant: carry to term]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "miscarry":
   abort, break down, come to grief, die, fail, fall through, flop,
   founder, go amiss, go astray, go awry, go wrong, misfire, miss,
   miss out, miss stays, miss the boat, miss the mark, perish