noun
a small mark or stain, typically one that is irregular in shape
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The artist carefully covered up the blotch on the canvas with a layer of white paint.
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I accidentally spilled coffee on my shirt and now there's a big blotch on it.
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She got a blotch of ketchup on her pants while eating her fries.
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The scandal left a blotch on his reputation that he could never fully erase.