The Collaborative International Dictionary of English v.0.48:

Unfurl \Un*furl"\, v. t. & i. [1st pref. un- + furl.]
   To loose from a furled state; to unfold; to expand; to open
   or spread; as, to unfurl sails; to unfurl a flag.
   [1913 Webster]

WordNet (r) 3.0 (2006):

unfurl
    v 1: unroll, unfold, or spread out or be unrolled, unfolded, or
         spread out from a furled state; "unfurl a banner" [syn:
         unfurl, unroll] [ant: roll up, wrap up]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "unfurl":
   bare, break the seal, bring to light, develop, disclose, discover,
   dismask, draw the veil, expose, impart, lay bare, lay open,
   let daylight in, let out, manifest, open, open up,
   raise the curtain, reveal, show, show up, strip bare, uncloak,
   uncoil, uncover, undrape, unfold, unkennel, unmask, unpack, unreel,
   unroll, unscreen, unsheathe, unshroud, unveil, unwind, unwrap