Green’s Dictionary of Slang

get down v.2

[abbr. SE phr. get down to business]

1. [1910s+] (orig. US) to commit oneself, to make a serious effort.

2. [1930s+] (orig. US) to have sexual intercourse.

3. [1950s+] (orig. US) to dance, to have a good time.

4. [1960s+] (US black) to establish oneself, to work.

5. [1960s+] (orig. US, also get down with one’s bad self) to do something especially well.

6. [1970s] (US Und.) of a prostitute, to start work for the night.

7. [1970s+] to make something happen, to reach a successful conclusion.

8. [1970s+] to join in with, to take part in.

9. [1970s+] (US black) to fight.

10. [1980s] (US black) to attempt seduction.

In phrases

get down dirty (v.) (also get down fonky, …foul, ...shitty) [SE dirty/fonky adj.2 /shitty adj.1 (3)]

[1980s+] (US black) to become abusive, to cause trouble.

get down from the Y (v.)

see under Y n.

get down heavy (v.) [heavy adv. (2)]

[1930s–70s] (US black) to enjoy oneself, to enter wholeheartedly into the spirit of an occasion.

get down with one’s bad self (v.)

see sense 5 above.

SE in slang uses

In phrases

get down to the ground (and move it round and round) (v.)

[1980s] (US black) to have sexual intercourse.