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sinkhole (n.)

also sink-hole, mid-15c., "sewage pit," from sink (n.) + hole (n.). As a geological phenomenon, "hole made in the earth in limestone regions by underground erosion," 1780, from sink (v.).

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Definitions of sinkhole from WordNet

sinkhole (n.)
a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof;
Synonyms: sink / swallow hole
From wordnet.princeton.edu