GNU Collaborative International Dictionary of English

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Found one definition

1.       
   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.]