Possible Origins of 'Raining Cats and Dogs' It's not entirely clear where the phrase "it's raining cats and dogs" originated, but there are a few theories. It might have come from Norse mythology.

Meaning: Raining very hard. In the old days people's homes had straw roofs and the cats and dogs would sleep up there. When it rained hard they would fall off on to the people below. Use it ...

Some idioms feel like they've been with us forever. We're used to saying it’s “raining cats and dogs”, we feel like “a fish out of water” or stop “pulling my leg”. But others have ...