It's raining cats and dogs

US /ɪts ˌreɪnɪŋ ˌkæts ənd ˈdɔɡz/
UK /ɪts ˌreɪnɪŋ ˌkæts ənd ˈdɔɡz/
"It's raining cats and dogs" picture
1.

倾盆大雨, 下大雨

raining very heavily

:
I can't go out now, it's raining cats and dogs!
我现在不能出去,外面下着倾盆大雨
We had to cancel the picnic because it was raining cats and dogs.
我们不得不取消野餐,因为下着倾盆大雨