Definitions of get down:

• verb:   take the first step or steps in carrying out an action

  Example: "Let's get down to work now"

• verb:   lower (one's body) as by kneeling

  Example: "Get down on your knees!"

• verb:   pass through the esophagus as part of eating or drinking
• verb:   put down in writing; of texts, musical compositions, etc.
• verb:   lower someone's spirits; make downhearted
• verb:   move something or somebody to a lower position
• verb:   get off (a horse)