(it's) raining cats and dogs Meaning You can say 'it's raini | English Language

(it's) raining cats and dogs

Meaning
You can say "it's raining cats and dogs" if it's raining very hard.

For example

We can't go now because it's raining cats and dogs

Why do people always use "it's raining cats and dogs" as an example of an idiom? No-one actually uses it any more, do they?
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