Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

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