come on

To encounter, discover; to come upon.

To appear on a stage or in a performance.

To be broadcast (through a device), or (of a broadcast) to begin playing.

To progress, to develop; to come along.

To activate; to turn on.

To show sexual or relational interest through words or sometimes actions.

To get one's period, start menstruating.

To enter the playing field.

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.

To appear or seem to be a particular.