- with the top side or part underneath or turned over; inverted
- in disorder; topsy-turvy
Origin of upside downMiddle English up so doun, literally , up as if down: altered by folk etymology
- So that the upper or right side is down: turned upside down.
- In great disorder.
- Being or holding an asset that is worth less than its purchase price or the debt owed on it.
Origin of upside downAlteration of Middle English up so doun, up as if down : up, up; see up + so, as if; see so1 + doun, down; see down1.