There are so many idioms and internationally they can vary from country to country.
Heavy rains:
For example, in the USA, it's raining dogs and cats. In Ireland: "It's throwing cobblers' knives." In Poland, France, Romania: "It's raining frogs." In Germany: "It's raining puppies."
When something is never going to happen:
In the USA, when hell freezes over and in France, when chickens have teeth.
What are some popular idioms where you're from and how do you think they came about?
Heavy rains:
For example, in the USA, it's raining dogs and cats. In Ireland: "It's throwing cobblers' knives." In Poland, France, Romania: "It's raining frogs." In Germany: "It's raining puppies."
When something is never going to happen:
In the USA, when hell freezes over and in France, when chickens have teeth.
What are some popular idioms where you're from and how do you think they came about?