The Collaborative International Dictionary of English v.0.48:

Dart \Dart\, v. i.
   1. To fly or pass swiftly, as a dart.
      [1913 Webster]

   2. To start and run with velocity; to shoot rapidly along;
      as, the deer darted from the thicket.
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The Collaborative International Dictionary of English v.0.48:

Dart \Dart\ (d[aum]rt), n. [OF. dart, of German origin; cf. OHG.
   tart javelin, dart, AS. dara[eth], daro[eth], Sw. dart
   dagger, Icel. darra[eth]r dart.]
   1. A pointed missile weapon, intended to be thrown by the
      hand; a short lance; a javelin; hence, any sharp-pointed
      missile weapon, as an arrow.
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            And he [Joab] took three darts in his hand, and
            thrust them through the heart of Absalom. --2 Sa.
                                                  xviii. 14.
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   2. Anything resembling a dart; anything that pierces or
      wounds like a dart.
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            The artful inquiry, whose venomed dart
            Scarce wounds the hearing while it stabs the heart.
                                                  --Hannan More.
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   3. A spear set as a prize in running. [Obs.] --Chaucer.
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   4. (Zool.) A fish; the dace. See Dace.
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   Dart sac (Zool.), a sac connected with the reproductive
      organs of land snails, which contains a dart, or arrowlike
      structure.
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The Collaborative International Dictionary of English v.0.48:

Dart \Dart\, v. t. [imp. & p. p. Darted; p. pr. & vb. n.
   Darting.]
   1. To throw with a sudden effort or thrust, as a dart or
      other missile weapon; to hurl or launch.
      [1913 Webster]

   2. To throw suddenly or rapidly; to send forth; to emit; to
      shoot; as, the sun darts forth his beams.
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            Or what ill eyes malignant glances dart? --Pope.
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WordNet (r) 3.0 (2006):

dart
    n 1: a small narrow pointed missile that is thrown or shot
    2: a tapered tuck made in dressmaking
    3: a sudden quick movement [syn: flit, dart]
    v 1: move along rapidly and lightly; skim or dart; "The
         hummingbird flitted among the branches" [syn: flit,
         flutter, fleet, dart]
    2: run or move very quickly or hastily; "She dashed into the
       yard" [syn: dart, dash, scoot, scud, flash,
       shoot]
    3: move with sudden speed; "His forefinger darted in all
       directions as he spoke"