DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Grabble \Grab"ble\, v. i. [imp. & p. p. Grabbled; p. pr. & vb.
      n. Grabbling.] [Freq. of grab; cf. D. grabbelen.]
      1. To grope; to feel with the hands.
         [1913 Webster]
               He puts his hands into his pockets, and keeps a
               grabbling and fumbling.               --Selden.
         [1913 Webster]
      2. To lie prostrate on the belly; to sprawl on the ground; to
         grovel. --Ainsworth.
         [1913 Webster]