descendez
You can say "se baisser" in French to mean bend down.
The translation for "go down" in French is "descendre".
Ralentir
S'installer
Descendre
écrire
Upside down is 'dessus-dessous' or 'sens dessus-dessous' in French.
Assez-vous
du calme!
You can say "allonge-toi avec moi" in French to ask someone to lay down with you.
Baisse le volume !
the leaves are falling down = les feuilles tombent