To encounter, discover; to come upon.
Turning the corner, I came on Julia sitting by the riverbank.
To appear on a stage or in a performance.
I think he's coming on too late after my line.
To appear on a television broadcast.
I was going to turn off the TV, but my favorite show came on.
To progress, to develop.
The new garden is coming on nicely.
(of a light) To start to shine, become lit.
The light came on as soon as I flicked the switch.
(with to) To show sexual or relational interest through words or sometimes actions.
She started coming on to me as soon as my wife left the room.
To get one's period, start menstruating.
(of a substitute) To enter the playing field.
(with adverbial words such as in, by, round, over, up, down) Elaboration of come (in the sense of move towards the speaker or other focus), emphasising motion or progress, or conveying a nuance of familiarity or encouragement.
Come on up to my place on the third floor.
Come along with me; join me in going.
I'll show you where the auditorium is. Come on!
An expression of encouragement.
Come on, George! You can win!
An expression of disbelief.
Come on! You can't possibly expect me to believe that.
An expression of frustration, exasperation, or impatience; hurry up.
Aw, come on! Get on with it!
An expression of defiance or as a challenge; approach; come at me.
Come on! I'm not afraid of you.
Something intended to attract, as in an advertisement.
The free offers are just come-ons to get you in the store so the sales staff can work on you.
A statement or sometimes action reflecting sexual or romantic interest.
I thought he'd asked me to lunch to discuss business; I wasn't expecting a come-on.
A bad actor whose talents do not extend far beyond walking onto the stage.