Webster’s Revised Unabridged Dictionary · 1913
Mush
Mush, n. [Perh. short for mush on, a corrupt of E. marchons, the cry of the voyageurs and coureurs de bois to their dogs.] A march on foot, esp. across the snow with dogs; as, he had a long mush before him; — also used attributively. [Colloq., Alaska & Northwestern U. S.]
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.]
Mush, v. t. To notch, cut, or indent, as cloth, with a stamp.