upside down 
adverb & adjective
1With the upper part where the lower part should be; in an inverted position: [as adverb]: the car rolled and landed upside down [as adjective]: an upside-down canoe...
- The counters were sparkling, the chairs were all upside-down on the tables, and the floor was swept.
- As she remains suspended in the upside-down position, he stations himself beneath her.
- Position the sink upside-down on the newly laminated counter top or the plywood base.
Synonyms
upturned, upended, bottom up, wrong side up, head over heels, inverted, reversed, overturned, capsized, upset, flipped
1.1In or into total disorder or confusion: [as adverb]: burglars have turned our house upside down...
- Not for the first time, I reflect on the topsy-turvy, upside-down parallel universe of India.
- It was a total disaster and turned upside down the conventional view of Victorian sexuality.
- The basis of the past policy behind economic diplomacy is now turned upside down.
Synonyms
in/into disarray, in/into disorder, jumbled up, in/into a jumble, in/into a muddle, untidy, disorganized, chaotic, all over the place, in/into chaos, in/into confusion, topsy-turvy, at sixes and sevens
informal messed up, higgledy-piggledy
throw into disarray, throw into disorder, make disorderly, disorder, untidy, make untidy, disorganize, disturb, jumble, mix up, muddle, upset, turn something topsy-turvy
informal mess up
North American informal muss up
Origin
Middle English: originally up so down, perhaps in the sense 'up as if down'.