The conversation between human and AI assistant.
[|Human|] What is the meaning of the following idiom?
[|AI|] The idiom "It’s raining cats and dogs" means that it is raining very heavily or pouring down, as if animals were falling from the sky. It is a colorful expression that is used to describe an intense rainstorm.
[|Human|] 
What is the meaning of the following idiom?