[turn] upside down
1
to reverse the position of something, making what was on top now at the bottom and vice versa
- Can you turn the mattress upside down for even wear?
- The magician turned the hat upside down, revealing a rabbit inside.
- The child turned the puzzle pieces upside down to start assembling them.
- Please turn the jar upside down before opening to mix the ingredients.
- The chef turned the cake upside down onto the plate for decoration.
2
to examine something thoroughly
- The detective turned the case upside down to find the crucial evidence.
- The researcher turned the data upside down to uncover patterns.
- The scientist turned the lab results upside down to analyze every aspect.
- The journalist turned the story upside down to reveal the hidden truth.
- The teacher turned the students' essays upside down to assess their understanding.