Webster's Revised Unabridged Dictionary · 1913

Mush

Mush , noun

[Compare Gael. mus, muss, pap, porridge, any thick preparation of fruit, Old High German muos; akin to Anglo-Saxon & Old Saxon mōs food, and prob, to English meat. See Meat.]

Meal (esp. Indian meal) boiled in water; hasty pudding; supawn. [United States]

Mush , transitive verb

[Compare French moucheter to cut with small cuts.]

To notch, cut, or indent, as cloth, with a stamp.

Mush , noun

[Perh. short for mush on, a corrupt of English 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. [Colloquial, Alaska & Northwestern United States]

Mush , intransitive verb

To travel on foot, esp. across the snow with dogs.
To cause to travel or journey. [Rare; Colloquial, Alaska & Northwestern United States]