Definition
This idiom is used to describe very heavy rainfall.
倾盆大雨
It's really raining cats and dogs today! I've never seen rain like this before.
今天真的下起了傾盆大雨！我從未見過這樣的雨勢。
We were planning to have a picnic, but it's raining cats and dogs outside.
我們原本計劃去野餐，但外面下起了傾盆大雨。
It was raining cats and dogs when I went to work, and I got completely soaked.
我去上班的時候下起了傾盆大雨，全身都濕透了。