sinkhole ( synonym found)
Definition of sinkhole:

°(Geology) A hole formed in soluble rock by the action of water, serving to conduct surface water to an underground passage.
°A depressed area in which waste or drainage collects.
Definition of sinkhole:

°(Geology) A hole formed in soluble rock by the action of water, serving to conduct surface water to an underground passage.
°A depressed area in which waste or drainage collects.
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