English Idiom of the Day – Raining Cats and Dogs
It's 'raining cats and dogs' means it is raining very heavily.
Example: You should take an umbrella with you, it is raining cats and dogs out there!
The weather was horrible yesterday. It was raining cats and dogs all day.
Did you know...? This phrase originated in 17th century England. Very heavy rain would occasionally wash dead animals through the street. The animals didn't fall from the sky of course, but the sight of dead cats and dogs being washed down the street with the rain caused people to joke that it must have been raining cats and dogs.