turn upside down

US /tɜːrn ˌʌpsaɪd ˈdaʊn/
UK /tɜːrn ˌʌpsaɪd ˈdaʊn/
"turn upside down" picture
1.

retourner à l'envers, renverser

to invert or flip something so that the top is at the bottom

:
He accidentally turned the box upside down, spilling all its contents.
Il a accidentellement retourné la boîte à l'envers, en renversant tout son contenu.
The strong winds turned the umbrella upside down.
Les vents forts ont retourné le parapluie à l'envers.
2.

bouleverser, mettre sens dessus dessous

to cause great disorder or confusion; to disrupt completely

:
The new policy turned the entire department upside down.
La nouvelle politique a bouleversé tout le département.
The unexpected news turned her world upside down.
La nouvelle inattendue a bouleversé son monde.