Use of idiom in writing

Idiom: A group of words whose meaning cannot be predicted from the meanings of the constituent words. As for example, “It was raining cats and dogs”.

Creative writing is as much about playing games as anything in life is. We play games with words and meanings. If we are writing sci-fi or fantasy, we may even invent languages for our characters, whole new worlds springing up from our writing. I am delighted with inventive writing, and if I venture thus far, I will try to ensure that my worl...