mush (interj.)

command to sled dogs, first recorded 1862, as mouche, perhaps altered from French marchons! "advance!" (imperative of marcher "to march;" see march (v.)).

mush (n.)

"kind of porridge," 1670s, in the American colonies, variant of mash (n.) "soft mixture." Meaning "anything soft and thick" is attested from 1824.

mush (v.)

"to pound to a pulp," 1781, from mush (n.). Related: Mushed; mushing.