get down is a verb meaning "lower (one's body) as by kneeling". It carries 7 recorded senses.
lower someone's spirits; make downhearted
“These news depressed her”
“The bad state of her child's health demoralizes her”
put down in writing; of texts, musical compositions, etc.
take the first step or steps in carrying out an action
“We began working at dawn”
“Who will start?”
“Get working as soon as the sun rises!”
“The first tourists began to arrive in Cambodia”
“He began early in the day”
“Let's get down to work now”
Definitions, synonyms and semantic relations for get down come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.