(n) An exterior door in a building above the ground floor that leads to absolutely nothing. Maybe it used to connect to another building now gone, maybe there was a fire escape, or maybe the goal was to thin the herd. But if you step out a death door without looking, you're fucked.
(synonym) doorway to death
A 58-year-old man was with his friends on April 30 when he left the noraebang, or karaoke room, in Chuncheon, Gangwon, to grab a drink, stepped through a death door and fell two stories to the ground outside, dying four days later from cardiopulmonary arrest due to brainstem paralysis.