The Collaborative International Dictionary of English v.0.48:

Unroll \Un*roll"\, v. t. [1st pref. un- + roll.] [Written also
   unrol.]
   [1913 Webster]
   1. To open, as what is rolled or convolved; as, to unroll
      cloth; to unroll a banner.
      [1913 Webster]

   2. To display; to reveal. --Dryden.
      [1913 Webster]

   3. To remove from a roll or register, as a name.
      [1913 Webster]

            If I make not this cheat bring out another . . . let
            me be unrolled and my name put in the book of
            virtue!                               --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

unroll
    v 1: reverse the winding or twisting of; "unwind a ball of yarn"
         [syn: unwind, wind off, unroll] [ant: roll,
         twine, wind, wrap]
    2: 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]