turn something upside down

Từ điển Oxford Advanced Learner 8th

turn sth ˌupside ˈdown idiom
1. to make a place untidy when looking for sth
• The police turned the whole house upside down looking for clues.
2. to cause large changes and confusion in a person's life
•His sudden death turned her world upside down.
Main entry: ↑upside down_idiom