share (one's) sorrow
1. To commiserate with one about the same or similar loss, disappointment, or misfortune. A: "I lost nearly everything during the economic crash." B: "I share your sorrow. I had to shutter the business my great-grandfather built because of the crash." We're going down to the bar with the other laid-off workers to share their sorrow.
2. To relate one's loss, disappointment, misfortune, or the source thereof to someone else. You should keep all that grief bottled up inside. It's important to share your sorrow with someone who can help you learn how to cope with it. It was nearly a year after her father died that Sarah finally shared her sorrow with me.
share someone's sorrow
to grieve as someone else grieves. We all share your sorrow on this sad, sad day. I am sorry to hear about the death in your family. I share your sorrow.