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Pollute (related words: pollution, pollutant)


Definition
To put harmful materials into the air, water, or soil (related words: pollution, pollutant)
 
Key Context
The sky in big cities looks grey and dirty on a hot summer day. This pollution comes from the burning of fossil fuels. If you stand close enough to the exhaust of a car, the smoke will make you cough. When harmful things are added to the air, water, or soil, it is known as pollution.