|Origin:||up so down 'up as if down' (14-16 centuries)|
with the top at the bottom and the bottom at the top:
To get the plant out of the pot, turn it upside down and give it a gentle knock.
to make a place very untidy when you are looking for something:
The burglars have turned our house upside down.
to cause a lot of change and confusion in a situation or in someone's life:
the story of a young girl whose life was turned upside down
disorganized or untidy