noun
a gas, especially methane, found in coal mines and liable to explode upon ignition
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Miners need to be cautious of the presence of firedamp in underground coal mines.
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Hey, watch out for firedamp when you're down in the mine!
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Dude, don't mess around with firedamp in the mines, it's dangerous.
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The tension in the room was like firedamp, ready to explode at any moment.