The Collaborative International Dictionary of English v.0.48:

Rustle \Rus"tle\, v. i. [imp. & p. p. Rustled; p. pr. & vb. n.
   Rustling.] [AS. hristlan to rustle; or cf. Sw. rusta to
   stir, make a riot, or E. rush, v.]
   1. To make a quick succession of small sounds, like the
      rubbing or moving of silk cloth or dry leaves.
      [1913 Webster]

            He is coming; I hear his straw rustle. --Shak.
      [1913 Webster]

            Prouder than rustling in unpaid-for silk. --Shak.
      [1913 Webster]

   2. To stir about energetically; to strive to succeed; to
      bustle about. [Slang, Western U.S.]
      [1913 Webster]

   3. To steal; -- used of livestock and esp. of cattle.
      [PJC]

   To rustle up To gather or find by searching; as, to rustle
      up some food for supper.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Rustle \Rus"tle\, v. t.
   To cause to rustle; as, the wind rustles the leaves.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rustle \Rus"tle\, n.
   A quick succession or confusion of small sounds, like those
   made by shaking leaves or straw, by rubbing silk, or the
   like; a rustling.
   [1913 Webster]

         When the noise of a torrent, the rustle of a wood, the
         song of birds, or the play of lambs, had power to fill
         the attention, and suspend all perception of the course
         of time.                                 --Idler.
   [1913 Webster]

WordNet (r) 3.0 (2006):

rustle
    n 1: a light noise, like the noise of silk clothing or leaves
         blowing in the wind [syn: rustle, rustling, whisper,
         whispering]
    v 1: make a dry crackling sound; "rustling silk"; "the dry
         leaves were rustling in the breeze"
    2: take illegally; "rustle cattle" [syn: rustle, lift]
    3: forage food