1.to start working by being switched on; to start to be broadcast
2.to appear on a stage; to appear on television, or to be heard on the radio; to arrive on a sports field in order to replace another member of your team
3.if an illness comes on, it starts to affect you
4.used for telling someone to hurry; used for encouraging someone to do something such as make a greater effort or stop being sad; used for telling someone that you do not believe what they are saying; used for trying to make someone fight you
5.to show very clearly that you are determined to do something, especially to start a sexual relationship with someone
6.to meet someone or find something by chance
came on