Sinkhole meaning

sĭngkhōl
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noun
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A natural depression in a land surface communicating with a subterranean passage, generally occurring in limestone regions and formed by solution or by collapse of a cavern roof.
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A saucer-shaped surface depression produced when underlying material, such as limestone or salt, dissolves or when caves, mines, etc. collapse.
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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.
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(geology) A hole formed in soluble rock by the action of water, serving to conduct surface water to an underground passage.
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A depressed area in which waste or drainage collects.
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(pinball) A hole in the playfield that rewards the player when the ball is guided into it.
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(Internet) A DNS server that has been configured to hand out non-routeable addresses for all domains, so that every computer that uses it will fail to get access to the real website.
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