Die Out Meaning
(idiomatic) To cease gradually.
Example: 1963, Margery Allingham, chapter 1, The China Governess:
The original family who had begun to build a palace to rival Nonesuch had died out before they had put up little more than the gateway, [â€¦].
The dinosaurs died out a long time ago.â€Ž
The prejudice has died out.