一、基本释义
upside 是一个英语名词，常用于短语 upside down 中，表示“上下颠倒”、“完全翻转”的状态。
二、常见搭配与短语
- upside down：上下颠倒；乱七八糟
- turn something upside down：把某物彻底翻转或搜查
- the world turned upside down：天翻地覆（比喻巨大变化）
三、经典例句
- The picture was hanging upside down.
- She turned the room upside down looking for her keys.
- After the earthquake, everything was upside down.
- His life was turned upside down when he lost his job.
四、语法与使用注意
Upside 单独使用较少，几乎总是和 down 搭配构成固定短语。该短语可作表语、宾语补足语或状语，具体取决于句子结构。
注意不要误写为 “up side” 或 “up-side”，正确形式为连写的 upside down。