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.
He is coming; I hear his straw rustle. --Shak.
Prouder than rustling in unpaid-for silk. --Shak.
2. To stir about energetically; to strive to succeed; to
bustle about. [Slang, Western U.S.]
3. To steal; -- used of livestock and esp. of cattle.
To rustle up To gather or find by searching; as, to rustle
up some food for supper.