upside down /ˈʌpˌsaɪdˈdaʊn/ adverb Learner's definition of UPSIDE DOWN
: with the top at the bottom and the bottom at the top : placed so that the end that should be at the top is at the bottom颠倒；倒转；翻转 -
You hung the picture upside down!你把照片挂倒了！
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To remove the plant, turn the pot upside down and tap gently on the bottom to loosen it.要移动这株植物，先把花盆倒扣过来，然后轻敲花盆底部使其松动。
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The baby was holding the book upside down.婴儿把书拿倒了。
turn (something) upside down
informal
: to make (something) very untidy把…弄得乱七八糟；使凌乱不堪 —
often used figuratively常用作比喻