Definition
To search thoroughly for something, often resulting in a state of disarray.
翻个底朝天（形容彻底搜寻）
They turned the entire house upside down, but still couldn't find the keys.
他们把整个房子翻了个底朝天，但还是找不到钥匙。
The police turned the suspect’s apartment upside down, hoping to find evidence.
警方把嫌疑人的公寓翻了个底朝天，希望能找到证据。
I turned my entire backpack upside down to find my passport.
我把整个背包翻了个底朝天，想找到我的护照。