Different countries have different customs(习俗) in the world. It's very important for us to know about them.
When you go to the US, someone often says to you "give me five". What should you do? Don't get five dollars from your pocket! It will make others laugh! The person isn't asking for your money, but your fingers.
In the US, "give me five "or "give me the high five" is a popular gesture. You can see it often in films or on TV. It means hitting each other's right hands together.
People do it when they meet for the first time or something happy happens. For example, a student has good marks in exams. If a football team wins a game, the players will give high fives to everyone around to celebrate.
This gesture may come from the old Roman gesture of lifting the right arm for the emperor(皇帝). This showed the person lifting his arm didn't have a sword(剑) in his hand.
Why not try to give the high five to your friends?
