bottomless pit

hell ( def 1 ).
something that drains all one's energy or resources.

1525–35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Slang Dictionary

bottomless pit definition

  1. n.
    a very hungry person. : The guy is a bottomless pit. There isn't enough food in town to fill him up.
  2. n.
    an endless source of something, usually something troublesome. : Our problems come from a bottomless pit. There is just no end to them.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
Pouring any more money into this bottomless pit is useless.
The stay is designed as a window of opportunity, not a bottomless pit.
It is a bottomless pit, so deep that you can not measure it.
The compliance process should not be a bottomless pit into which registrants
  throw resources and money.
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