The Collaborative International Dictionary of English v.0.48:

Mush \Mush\, n. [Cf. Gael. mus, muss, pap, porridge, any thick
   preparation of fruit, OHG. muos; akin to AS. & OS. m[=o]s
   food, and prob, to E. meat. See Meat.]
   Meal (esp. Indian meal) boiled in water; hasty pudding;
   supawn. [U.S.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mush \Mush\, v. t. [Cf. F. moucheter to cut with small cuts.]
   To notch, cut, or indent, as cloth, with a stamp.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.]
   [Webster 1913 Suppl.]

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.]

WordNet (r) 3.0 (2006):

mush
    n 1: any soft or soggy mass; "he pounded it to a pulp" [syn:
         pulp, mush]
    2: cornmeal boiled in water [syn: mush, cornmeal mush]
    3: writing or music that is excessively sweet and sentimental
       [syn: treacle, mush, slop, glop]
    4: a journey by dogsled
    v 1: drive (a team of dogs or a dogsled)
    2: travel with a dogsled [syn: dogsled, mush]

The Free On-line Dictionary of Computing (19 January 2023):

MUSH

   1.  Multi-User Shared Hallucination.

   2.  Mail Users' Shell.