Rain cats and dogs is an idiom that means “to rain very heavily””.”
Rain cats and dogs is a phrase that is used to describe very heavy rain. It is thought to have originated in the 17th century, and there are a few theories about how it came to be. One theory is that it refers to the way that rain can fall in sheets, like cats and dogs falling from the sky. Another theory is that it refers to the way that cats and dogs often get wet when it rains. Whatever the origin, the phrase is now a common way to describe heavy rain.
It was raining cats and dogs when we went to the park.
The rain was coming down in sheets, like cats and dogs.
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