swallow hole
noun
- 1
a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
Also useful for “swallow hole”:Crossword— Multi-word entries show up in clues
a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
Also useful for “swallow hole”:Crossword— Multi-word entries show up in clues