GNU Collaborative International Dictionary of English

Found one definition

1.       
   Sidle (?), v. t. [imp. & p. p. Sidled (?); p. pr. & vb. n. Sidling (?).] [From Side.] To go or move with one side foremost; to move sidewise; as, “to sidle through a crowd or narrow opening”.  Swift.
   
   [1913 Webster]
   
   He . . . then sidled close to the astonished girl. Sir W. Scott.
   
   [1913 Webster]