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A natural depression formed by the undermining or sudden collapse of the land surface, often as a result of groundwater enlarging cavities in underlying limestone or other easily soluble bedrock.
1. (Physical Geography) Also called (esp Brit): swallow hole a depression in the ground surface, esp in limestone, where a surface stream disappears underground
2. a place into which foul matter runs
1. a hole formed in soluble rock by the action of water, serving to conduct surface water underground.
2. a depressed area in which waste or drainage collects.
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|Noun||1.||sinkhole - a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof|