rain cats and dogs
US /reɪn kæts ænd dɔɡz/
UK /reɪn kæts ænd dɔɡz/

1.
下傾盆大雨, 大雨滂沱
to rain very heavily
:
•
I can't go out now, it's raining cats and dogs!
我現在不能出去,外面下著傾盆大雨!
•
We had to cancel the picnic because it started to rain cats and dogs.
我們不得不取消野餐,因為它開始下傾盆大雨。