noun
a term used to describe water that is dark or murky in color, often due to the presence of dissolved organic matter or minerals
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The environmental agency is investigating the contamination of the river with blackwater.
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I wouldn't swim in that blackwater, it looks pretty dirty.
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The kids call that section of the creek 'blackwater' because it's so polluted.
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The corruption in that company runs deep, like blackwater in a swamp.