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.
References in periodicals archive ?
Alun Thomas, of Guisborough, Cleveland, is this week's pounds 25 winner for asking: "If water goes down the plughole clockwise in the northern hemisphere and anti-clockwise in the southern hemisphere, what does it do at the Equator - and how does it know it's there?
It's not his money and it's no skin off his nose if La Parra goes down the plughole.
Immortal post-coital conversation from Curly Watts to man-eater Maxine in The Street: "Do you know that in the southern hemisphere water goes down the plughole in a different direction?