mush (v.) Look up mush at Dictionary.com
"to pound to a pulp," 1781, from mush (n.). Related: Mushed; mushing.
mush (n.) Look up mush at Dictionary.com
"kind of porridge," 1670s, in the American colonies, variant of mash (n.) "soft mixture." Meaning "anything soft and thick" is attested from 1824.
mush (interj.) Look up mush at Dictionary.com
command to sled dogs, first recorded 1862, as mouche, perhaps altered from French marchons! "advance!" (imperative of marcher "to march;" see march (v.)).