The Collaborative International Dictionary of English v.0.48:

Drift \Drift\, v. i. [imp. & p. p. Drifted; p. pr. & vb. n.
   Drifting.]
   1. To float or be driven along by, or as by, a current of
      water or air; as, the ship drifted astern; a raft drifted
      ashore; the balloon drifts slowly east.
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            We drifted o'er the harbor bar.       -- Coleridge.
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   2. To accumulate in heaps by the force of wind; to be driven
      into heaps; as, snow or sand drifts.
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   3. (mining) to make a drift; to examine a vein or ledge for
      the purpose of ascertaining the presence of metals or
      ores; to follow a vein; to prospect. [U.S.]
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