Final answer:
An idiomatic expression is 'raining cats and dogs' which means heavy rainfall.
Explanation:
It is raining cats and dogs is an example of an idiom. Idioms are common phrases that convey a figurative meaning different from the literal interpretation of the words used.
For instance, when someone says 'it's raining cats and dogs,' they don't mean that actual cats and dogs are falling from the sky, but rather that it's raining heavily.
Understanding idioms is crucial in language comprehension and communication.
Learn more about Idioms in English Language here:
https://brainly.com/question/51397259
