Welcome to another week of idioms! We start off with a funny one: It's Raining Cats and Dogs.
What it means is that it is raining so hard as to be unbelievable (like if it rained cats and dogs). There does not seem to be any agreement about the origin of this. My thought is that it was always metaphorical and created to be poetic and humorous.
So, the next time that you get caught out in a heavy rain ...
... you know what to say. Gosh! It's raining cats and dogs!
Tune in tomorrow for Feeling Under the Weather.