Here is a list of common idioms and their meanings:

 

• A piece of cake: Something that is very easy to do.
• 
  
• Break the ice: 
• To start a conversation in an awkward or tense situation.
• 
  
• Bite the bullet: 
• To face a difficult or unpleasant situation with courage.
• 
  
• Costs an arm and a leg: 
• Something is very expensive.
• Hit the books: 
• To study hard.
• 
  
• Kill two birds with one stone: 
• To accomplish two things with a single action.
• 
  
• Let the cat out of the bag: 
• To accidentally reveal a secret.
• 
  
• Once in a blue moon: 
• Something that happens very rarely.
• 
  
• Piece of cake: 
• Something very easy to do.
• 
  
• Spill the beans: 
• To reveal a secret.
• 
  
• Under the weather: 
• Feeling sick or unwell.
• 
  
• The ball is in your court: 
• It's your turn to take action or make a decision.
• 
  
• Burn the midnight oil: 
• To work late into the night.
• 
  
• Hit the nail on the head: 
• To describe exactly what is causing a problem.
• 
  
• To not see the wood for the trees: 
• To be so involved with the details that you don't get the most important facts.