Pollute (verb)

1. Make (water, air, or land) harmful to health or the environment as a result of the addition of a contaminant.
2. Make impure or unclean.

Origin:

Late middle english: from latin pollutus, past participle of polluere "defile, soil", from polluere "to soil, defile".

Examples:

1. The factory polluted the river with its waste.
2. The oil spill polluted the ocean.
3. The air pollution is polluting the city's air.
4. The company was fined for polluting the water supply.
5. The chemical spill polluted the soil.