Wiktionary
come on to
vb. 1 (lb en transitive informal) To make a romantic or sexual advance to; to hit on. 2 To start to.
Usage examples of "come on to".
Even in the shadowy light, though, she could tell he wasn't the jerk who had tried to come on to her.
But she had come on to the bridge still suffering from head injuries sustained during a disastrous landing expedition to the planet Zondar.