1. swallow_hole - noun
ยท a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
Hypernym(s): natural_depression, depression
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ยท a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
Hypernym(s): natural_depression, depression