noun
a type of gas found in mines that is colorless, odorless, and toxic
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The miners were warned about the presence of blackdamp in the underground tunnels.
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Hey, stay away from that area in the mine, it's full of blackdamp.
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Don't go near that part of the mine, it's filled with blackdamp, dude.
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The toxic atmosphere in the meeting room felt like a cloud of blackdamp hanging over us.