They LIE down (to lie, lay, lain). LAY the table, please! (to lay, laid, laid).
Get Down or Lay Down was created in 2000.
Lay Me Down was created in 2010.
It is not a combined form. The word "down" is an adverb. It can modify verbs such as lay.
You can't lay down in clubpenguin. Sorry.
The past tense of "lie down" is "lay down."
The past tense of "lay down" is "laid down."
"lay" is a verb and "down" is an adverb.
As I Lay Me Down was created on 1995-02-07.
Lay Down was created on 1972-10-13.
Lay Down Beside Me was created in 1979.
Lay Your Troubles Down was created in 1989.