down - having the part which is usually at the top turned to be at the bottomPut the lid on tightly, turn the honey jar upside down and see how slowly the air bubbles rise.The most exciting part of the display was when the plane was flying upside down at high speed.One car flipped over in the crash and came to rest upside down in the middle of the road.(figurative) Another poor harvest could turn the country's economy upside down (= completely change it in a bad way).(figurative) He lived in an upside-down world after she left him, in which nothing seemed to make sense.
UPSIDE
Meaning of UPSIDE in English
Cambridge English vocab. Кембриджский английский словарь. 2012