sinkhole

[singk-hohl]
noun
1.
a hole formed in soluble rock by the action of water, serving to conduct surface water to an underground passage.
2.
Also called sink. a depressed area in which waste or drainage collects.

Origin:
1425–75; late Middle English; see sink, hole

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
sinkhole (ˈsɪŋkˌhəʊl)
 
n
1.  Also called (esp Brit): swallow hole a depression in the ground surface, esp in limestone, where a surface stream disappears underground
2.  a place into which foul matter runs

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
sinkhole   (sĭngk'hōl')  Pronunciation Key 
A natural depression in a land surface formed by the dissolution and collapse of a cavern roof. Sinkholes are roughly funnel-shaped and on the order of tens of meters in size. They generally occur in limestone regions and are connected to subteranean passages. Also called sink. See more at karst topography.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The single larger room is off-limits because of a giant sinkhole in the floor.
Rappel into a sinkhole, swim in a subterranean river and watch out for bats and
  cave scorpions.
His eloquence is all the more remarkable because migraines are a sinkhole for
  language.
These factors make understanding sensitive sinkhole ecosystems an urgent
  necessity.
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