A mark or spot made by blood.

Figuratively, it can refer to a scar or reminder of past violence or wrongdoing.

अतीत की हिंसा या गलतियों की यादगार

English Usage: The bloodstain of betrayal lingered in their relationship.

Hindi Usage: धोखे का खून का धब्बा उनके रिश्ते में बना रहा।