plughole
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plughole
[′pləg‚hōl] (mining engineering)
A passageway left open while an old portion of a mine is sealed off, to help maintain normal ventilation; it is sealed when the work is finished.
A hole for an explosive charge or for a bolt.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.