adverb Etymology: alteration of Middle English up so doun, from up + so + doun down Date: 15th century in such a way that the upper and the lower parts are reversed in position, in or into great disorder , upside-down adjective
UPSIDE DOWN
Meaning of UPSIDE DOWN in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012