Rain cats and dogs
Dropping heavy rain | To rain very heavily
The cat dog is a natural enemy, and the rack is coming, the sky is covered, the number is called and sharp, just like thunderstorms, so it is also used as "down the cat under the dog".
Some people say that the past underground drainage system is not good, after heavy rain, the body of the wild cat wild dog is floating everywhere.
Another origin about this is that in the myth of Nordic, the witch that controls the storm is usually embarrassing into a black cat. The sea sailors will know that the storm will come, and they also have a idiom: The cat has a gale of wind in her tail. Not just a cat said that the weather is not good, the dog is also a symbol of the wind. If the storm, the Odin is coming with a cat dog, then it will be heavy and the wind is good.
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