Swallow hole | Article about swallow hole by The Free Dictionary
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swallow hole[′swäl·ō ‚hōl]
An opening that occurs occasionally at the bottom of a sinkhole which permits direct drainage from the surface into an underground channel.
A term occasionally used as a synonym for owl hole although swallow holes are usually smaller.
References in periodicals archive
As water levels fall, the overflow channels drain water on the floor back into swallow holes that line the overflow channels (Malott 1952).
1952, The Swallow Holes of the Lost River, Orange County, Indiana.