DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Mush \Mush\, v. i. [imp. & p. p. Mushed; p. pr. & vb. n.
      Mushing.]
      To travel on foot, esp. across the snow with dogs. -- v. t.
      To cause to travel or journey. [Rare] [Colloq., Alaska &
      Northwestern U. S.]
      [Webster 1913 Suppl.]