Princeton's WordNet

1. inverted, upside-down(adverb)

   being in such a position that top and bottom are reversed

   "a quotation mark is sometimes called an inverted comma"; "an upside-down cake"

2. upside down(adverb)

   in an inverted manner

   "the box was lying on the floor upside down"

Kernerman English Learner's Dictionary

1. upside down(adverb)ˈʌpˌsaɪd for 1,3; ˈʌpˈsaɪd for 6

   with the part that is usually on the bottom on top

   The turtle was lying upside down on its shell.

2. upside downˈʌpˌsaɪd for 1,3; ˈʌpˈsaɪd for 6

   to cause a lot of mess or confusion

   They turned the room upside down looking for cash.; a shape like an upside down pyramid

Wiktionary

1. upside down(Adverb)

   Inverted, so that the top is now at the bottom

2. upside down(Adverb)

   In great disorder

3. upside down(Adjective)

   Inverted; turned so that the top is at the bottom.

4. upside down(Adjective)

   Owing more money for something than it is worth; having negative equity.

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