Contaminate
/kəˈntæməˌneɪt/
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Definition
(verb) To make something dangerous or toxic by introducing impurities or foreign matter.
Sentence Examples
If you don't wash your hand before working, you'll contaminate the samples.
I don't want to contaminate the clean glasses by taking them out of the dishwasher.
CEFR Practice Quiz
If you don't wash your hand before working, you'll ____ the samples.