come on phrasal verb ( see also ↑ come )
1 . come on! spoken
a) used to tell someone to hurry:
Come on, we’ll be late!
b) used to encourage someone to do something:
Come on, you can do it!
Come on, cheer up!
c) used to tell someone that you know that what they have just said was not true or right:
Oh come on, don’t lie!
d) used to make someone angry enough to want to fight you:
Come on, then, hit me!
2 . come on in/over/up etc spoken used to tell someone to come in, over, up etc, usually in a friendly way:
Come on in – I’ve made some coffee.
3 . if a light or machine comes on, it starts working:
A dog started barking and lights came on in the house.
4 . if an illness comes on, you start to be ill with it:
I can feel a headache coming on.
5 . if a television or radio programme comes on, it starts:
Just at that moment, the news came on.
6 . if rain or snow comes on, it starts:
The rain came on just before lunchtime.
7 . to come onto a stage or sports field:
He scored only two minutes after he’d come on.
8 . to improve or make progress:
The children are really coming on now.
Your English is coming on really well.
9 . come on somebody/something to find or discover someone or something by chance:
We came on a group of students having a picnic.
10 . come on strong informal to make it very clear to someone that you think they are sexually attractive