1everything turned on its head
2sky and the earth turning upside down (idiom); fig. complete confusion
Example
xiāng bǐ相比èr二shí十nián qián年前de的rì běn日本，xiàn zài现在de的rì běn日本yǒu有liǎo了fān tiān fù dì翻天覆地de的biàn huà变化。
相比二十年前的日本，现在的日本有了翻天覆地的变化。
Japan is now very different from what it was twenty years ago.