1
be upside down
用于描述事物处于颠倒状态。
The sign is upside down.
这个标志是颠倒的。
颠倒的；倒置的
先理解核心含义，再看它在真实句子里的用法。
颠倒的；倒置的
inverted; with the top at the bottom
The sign is upside down.
这个标志是颠倒的。
颠倒的；翻转使顶部朝下。
Inverted; turned so that the top is at the bottom.
极度混乱；乱七八糟。
In great disorder.
欠款超过其价值；负资产。
Owing more money for something than it is worth; having negative equity.
The picture on the wall is upside down; we need to hang it correctly.
墙上的画是倒着的；我们需要把它重新挂正。
She was holding the book upside down, pretending to read.
她倒拿着书，假装在阅读。
After the storm, the garden table was upside down in the middle of the yard.
暴风雨过后，花园里的桌子倒扣在院子中央。
用于描述事物处于颠倒状态。
The sign is upside down.
这个标志是颠倒的。
用于描述将某物翻转至颠倒状态，常与turn、flip等动词连用。
She turned the cake upside down onto a plate.
她把蛋糕倒扣在盘子里。
Not this
He upside down the cup.
Use this
He turned the cup upside down.
在英语中，“upside down”是形容词短语，不能用作动词。中文的“颠倒”可作动词，导致学习者误将“upside down”当动词用。正确应使用动词“turn”或“flip”等，后接名词和“upside down”作宾语补足语。
Not this
You put your jacket on upside down.
Use this
You put your jacket on inside out.
“Upside down”指上下颠倒，而“inside out”指里外翻转。中文“穿反了”可能意指里外反或前后反，学习者容易混淆。服装里外反应用“inside out”。
Choose the next layer that will help you use upside down with more confidence.
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use upside down naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
常用于系动词后作表语或名词前作定语，注意书写时作定语常带连字符
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.