sorrow over (someone or something)
To grieve or lament for someone or something; to be full of sorrow because of someone or something. I know you miss him, but you need to stop sorrowing over Jonathan and start living your life again. People sorrowing over the results of the election need to get ahold of themselves. This is not the end of the world as we know it.
sorrow over someone or something
to grieve or feel sad about someone or something. There is no need to sorrow over Tom. He will come back. He is sorrowing over the business he has lost because of the weather.