DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Sper \Sper\, Sperre \Sperre\, v. t. [See Spar bar.]
      To shut in; to support; to inclose; to fasten. [Obs.] "To
      sperre the gate." --Spenser.
      [1913 Webster]