bottomless pit

noun5

1. •
   A pit with no visible bottom and apparently infinite depth.
2. •
   An in-game hazard made up of a deep hole or void with no visible bottom, falling into which typically costs the player a life.
3. •
   (figurative) A person with an apparently boundless appetite; an entity or problem which consumes seemingly endless resources.

   • In other words, we will continue throwing good money after bad, trying to feed a bottomless pit's insatiable appetite for taxpayer dollars. — 2006
4. •
   (figurative) An endless resource or supply.

   • Lipsius was replaced at Leyden by Joseph Justus Scaliger (1540-1609), the French Protestant scholar who was known to contemporaries as "the bottomless pit of erudition." — 1994
5. •
   Hell.

   • And they had a king over them, which is the angel of the bottomless pit, whose name in the Hebrew tongue is Abaddon, but in the Greek tongue hath his name Apollyon. — 1769