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- It’s raining cats and dogs — it is raining very heavily
- Under the weather — feeling sick or unwell
- Hit the hay — to go to bed / go to sleep
- Piece of cake — something very easy to do
- Break a leg — good luck!
- Costs an arm and a leg — very expensive
- Once in a blue moon — something that happens very rarely
- Hit the nail on the head — to say something exactly right
- Keep an eye on — to watch or look after something or someone carefully
- Bite the bullet — to do something difficult you have been avoiding
