Murder hole

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A murder hole or meurtrière is a hole in the ceiling of a gateway or passageway in a fortification through which the defenders could shoot, throw or pour harmful substances or objects such as rocks, arrows, scalding water, hot sand, quicklime, or hot oil (rarely used because of its cost), down on attackers.

Excerpt from the Wikipedia article “Murder hole”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Manxruler, CC BY-SA 3.0, via Wikimedia Commons.