What does it mean to adulterate something?

To adulterate something means to corrupt or make it worse by adding something of lesser value. This term is often used in contexts like food or drink, where a pure substance is compromised by the introduction of inferior or substandard ingredients. For example, if a manufacturer adds cheap fillers to a high-quality product, they are adulterating it—diluting its quality and integrity. Adulteration is generally viewed as a negative action, as it diminishes the original value and can also pose health risks. This understanding aligns well with the definition provided in the correct answer.