10 popular English idioms: 1.Piece of cake 🍰 - Very easy to do. 2.Break a leg 🎭 - Good luck (especially for performers). 3.Bite the bullet 🔫 - To do something unpleasant that you have been avoiding. 4.Cost an arm and a leg 💸 - Very expensive. 5.Go the extra mile 🏃♂️ - To make a special effort. 6.Hit the sack 😴 - Go to bed. 7.Spill the beans 🙊 - To reveal a secret. 8.Let the cat out of the bag 🐈⬛ - To reveal a secret accidentally. 9.Raining cats and dogs 🌧️☔️ - Raining very heavily. 10.See eye to eye 👀👀 - To agree with someone.