to turn upside down
01
to reverse the position of something, making what was on top now at the bottom and vice versa
Collocation
Exempel
Can you turn the mattress upside down for even wear?
The magician turned the hat upside down, revealing a rabbit inside.
02
to examine something thoroughly
Exempel
The detective turned the case upside down to find the crucial evidence.
The researcher turned the data upside down to uncover patterns.
