it is raining cats and dogs
The Chinese idiom, D à y à Q à NGP é n in pinyin, means that the rain is as heavy as the water in a basin. It's a heavy rain. From the White Emperor by Du Fu of Tang Dynasty.
The origin of Idioms
The poem "Bai Di" by Du Fu of Tang Dynasty: "when the clouds go out of Bai Di's city, it rains and turns over the basin in Bai Di's city."
Idiom usage
Suddenly, the black clouds on the four sides suddenly merged and the rain poured down. (Chapter 14 of biography of heroes by Xu Wei in Ming Dynasty)
Analysis of Idioms
Synonyms: downpour, downpour, torrential rain, storm. Antonyms: niuxieyu, hefengxiyu, Mengmeng Xiyu.
it is raining cats and dogs
all sorts of feelings well up in one 's mind - gǎn kǎi wàn duān