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.

비가 억수같이 오다, 비가 쏟아지다

raining very heavily

:
I can't go out now, it's raining cats and dogs!
지금 나갈 수 없어, 비가 억수같이 와!
We had to cancel the picnic because it was raining cats and dogs.
비가 억수같이 와서 소풍을 취소해야 했어.