noun
the draining away of water (or substances carried in it) from the surface of an area of land, a building or structure, etc.
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The runoff from the heavy rain caused flooding in the streets.
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After the storm, there was a lot of runoff in the yard.
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I slipped on the runoff from the sprinklers and fell on my butt.
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The runoff of ideas from the brainstorming session was impressive.