happen to
1. To be experienced by or befall someone or something. I hope something bad didn't happen to Marie—she's never this late for a meeting. A: "What on earth happened to my book?" B: "Oh, my Great Dane sat on it and bent the cover—sorry."
2. To do something unintentionally; to experience something by chance. I just happened to see your mother today—what a lovely woman! If you happen to see my copy of The Catcher in the Rye, could you put it aside for me?
happen to someone or something
to befall someone or something; to occur to someone or something. What is going to happen to me? Something awful happened to your car.