turn (something) upside down

to change something completely.

His experience in the war turned his world upside down.

The crash of the dot-com companies turned lives upside down.

Related vocabulary: turn something on its head

• run to seed
• run up
• run up against
• run up against someone
• run up against something
• run up something
• run up the flagpole
• run with it
• run with the hare and hunt with the hounds
• run you down
• run your eye over
• run your eye over something
• run your mouth
• run yourself into the ground
• rush of blood
• rush of blood to the head
• rustle up
• at first hand
• at first sight
• at full pelt
• at full steam
• at full stretch
• at full throttle
• at full tilt
• at hand