What is the meaning of idoims and give20example ofidoims and sentence?

Idioms are expressions that have a figurative meaning different from the literal meaning of the Words. Here are 4 examples:

1. "Piece of cake" - something very easy
2. "Hit the nail on the head" - to do or say something exactly right
3. "Cost an arm and a leg" - to be very expensive
4. "Break a leg" - good luck