Idioms are a group of words collected together which forms a
different meaning from that of the literal meaning of the
individual words used. Learning idioms is a fun activity though
it might be a bit hard. Knowing them always helps one to
communicate easily and have cheerful conversations. Cooking
up simple games with idioms is an enjoyable way to pass time

too. Here are a few examples:

• Giving someone the cold shoulder : ignoring someone
• Going on a wild goose chase : doing something that is pointless
•  Heard it on the grapevine : Hearing rumours about someone or
  something
•  Hitting the nail on the head : Performing a task with exactness
• Killing two birds with one stone : Accomplishing two different tasks in
  the same undertaking
•  Letting someone off the hook : Not holding someone responsible for
  something
• Letting the cat out of the bag : Sharing information that was intended
  to be a secret
• No pain, no gain : You have to work hard in order to see results
• On the ball : Doing a good job, being prompt, or being responsible
• Once in a blue moon : Something that doesn’t happen very often
• Piece of cake : A task or job that is easy to complete
•  Pulling someone’s leg : Joking with someone
• Speak of the devil : When the person you have just been talking
  about arrives
• Stealing someone’s thunder : Taking credit for someone else’s
  achievements
•  Straight from the horse’s mouth : Reading or hearing something from
  the source
• The last straw : The last difficulty or annoyance that makes the entire
  situation unbearable
• The elephant in the room : An issue, person, or problem that
  someone is trying to avoid
• Throwing caution to the wind : Being reckless or taking a risk
• Your guess is as good as mine : To not know something
• A snowball effect : Something has momentum and builds on each
  other, much like rolling a snowball down a hill to make it bigger
•  An apple a day keeps the doctor away : Apples are healthy and good
  for you
• Burning bridges : Damaging a relationship beyond repair
• Every dog has his day : Everyone gets their chance to do something big
• Fit as a fiddle : Excellent health
•  Go down in flames : To fail in a spectacular manner
• Getting a second wind : Having energy again after being tired or worn out.