In the 1500s, houses in Britain had thatched roofs with thick straw piled high and with no wood underneath. It was the only place for animals to get warm, so all the cats and other small animals lived in the roof. When it rained it became slippery and sometimes the animals would slip and fall off the roof. Hence the saying, “It’s raining cats and dogs”.
Nguồn gốc thành ngữ “it’s raining cats and dogs”