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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A term occasionally used as a synonym for owl hole although swallow holes are usually smaller.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.