sinkhole
noun
- cesspool
- ☆ a saucer-shaped surface depression produced when underlying material, such as limestone or salt, dissolves or when caves, mines, etc. collapse
See sinkhole in American Heritage Dictionary 4
(sĭngkˈhōlˌ)
noun 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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