It's raining cats and dogs
US /ɪts ˌreɪnɪŋ ˌkæts ənd ˈdɔɡz/
UK /ɪts ˌreɪnɪŋ ˌkæts ənd ˈdɔɡz/

1.
倾盆大雨, 下大雨
raining very heavily
:
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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。