swallow hole

World English Dictionary
swallow hole
 
n
chiefly (Brit) another word for sinkhole

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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WordNet
swallow hole

noun
a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof [syn: sinkhole
WordNet® 3.0, © 2006 by Princeton University.
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