Why would the driver of a dog-sled team use the word "mush"? He wants the dogs to sit.

He wants to dogs to leap forward.

He wants the dogs to wait.

He wants the dogs to go.

D) He wants the dogs to go.

The website etymonline says the following:

mush (interj.)

command to sled dogs, 1897, first recorded 1862, as mouche, perhaps altered from French marchons! "advance!" (imperative of marcher "to march;" see march (v.))

So basically the driver is shouting "march!" (more or less) to the dogs for them to move forward. The "interj." means "interjection".

the difference between an explicit and implicit meaning is that the explicit meaning of a poem is that the detail is exactly defined. nothing is left to interpretation. an implicit meaning is an implied meaning. kabir's poetry is both explicit and implicit in that it can be interpreted on different levels. the explicit meaning leaves nothing to interpretation while the implicit meaning leaves lots open to interpretation. an example of this is found in the poem "rumi and the spiritual lover". 

to save the day, harry must get past a scary three-headed guard dog.