'Disappear'. So, probably also dead but for some other purposes, Eggsy reasons. If you get hit by a car, that's pretty definitive. If whoever is running the show here wants access to their hostages for whatever reason, it makes some sense they'd just call it 'disappearance'. Eventually it becomes normalised. Apparently.

"Fuck me," he says quietly, and then looks at the other man. "...Sorry, it was decent of you to tell me this stuff. I should've - I'm Eggsy."

He holds out a hand.