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pollute To make something dirty or contaminate by adding impurities or harmful substances. ■ "I accidentally polluted my friend's shirt with my sweaty water bottle. Now we both have matching yellow stains!"
pollution The act of making something as dirty, smelly, or unpleasant as possible by introducing harmful substances into the environment. ■ "I accidentally polluted my neighbor's yard with dog poop. I guess you could say I have a 'poopy' track record."