Answer:Here are 20 idiomatic expressions with their meanings: 1. Bite the bullet: To face a difficult or unpleasant situation bravely.2. Break the ice: To make people feel more relaxed and comfortable, especially in a new or awkward situation.3. Cost an arm and a leg: To be very expensive.4. Hit the nail on the head: To do or say exactly the right thing.5. Spill the beans: To reveal a secret.6. Under the weather: To be feeling unwell or slightly sick.7. In hot water: To be in trouble.8. Hit the hay: To go to bed.9. Rise and shine: To wake up and be cheerful.10. I was just pulling your leg: To be joking.11. It's Greek to me: To be completely incomprehensible.12. Keep your chin up: To stay positive and hopeful in a difficult situation.13. Hold your horses: To wait or slow down.14. It's raining cats and dogs: To be raining very heavily.15. Once in a blue moon: Very rarely.16. Piece of cake: Very easy.17. Let the cat out of the bag: To reveal a secret.18. Get your act together: To start behaving in a more responsible way.19. Burn the midnight oil: To work late into the night.20. A dime a dozen: Very common or ordinary.