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Contaminate (Verb)

Make radioactive by adding radioactive material; "Don't drink the water--it's contaminated".

Verbs of size, temperature change, intensifying, etc..

The careless disposal of nuclear waste will contaminate the groundwater source.
Exposure to radon can contaminate a building's air and pose serious health risks to its occupants.
Scientists carefully packaged the hazardous materials to prevent them from contaminating the environment.
The factory's chemicals are likely to contaminate the nearby river, threatening aquatic life.
Engineers took precautions to ensure the radioactive core wouldn't contaminate the surrounding soil and water.

Make impure; "The industrial wastes polluted the lake".

Verbs of size, temperature change, intensifying, etc..

Chemicals from the factory contaminate the nearby water supply, posing serious health risks to local residents.
Bacteria can contaminate food if it's not handled properly, causing serious illness.
The use of pesticides in farming can contaminate soil and groundwater, affecting the ecosystem.
Heavy metals can contaminate the air, soil, and water around industrial sites, causing environmental damage.
Toxic waste from the landfill can contaminate the surrounding soil, making it uninhabitable for wildlife.