About the use of "Come on"

It might express incredulity: "Oh, come on."--meaning that your interlocutor doesn't believe you. It might express defiance: "Come on, tough guy."--meaning that one is not intimidated by a threat which has been made. It might simply be inclusive: "You're going to the beach? Can i come?" "Sure, come on." It might express impatience: "We've been waiting for you for a half hour, come on!"

There are many possible meanings. It is not, by any means, an important or frequently used locution, however.

It may also express bewilderment - "You truly believe that? Come on...?"

1.Used to indicate a request, encouragement, persuasion, etc .
e.g. Come on, sing us a song.
2.Used to urge others to go (do), meaning: hurry up .
e.g. Come on, it’s getting dark.
3.To express blame or impatience .
e.g.Come on,don’t sit there dreaming.
4.Used to challenge or irritate each other.
e.g.Come on! I’m not afraid of you.
5.For sports competitions and other occasions to encourage players .
e.g.Come on!Come on!" shouted the audience again and again.

"Come on! Come on! ......Hurry up Harry, come on"

Thank you very much.

You're welcome.