1. making something impure or of lower quality by adding inferior or harmful substances
Usage: present participle of adulterate

Examples

• The company was caught adulterating their olive oil with cheaper vegetable oils.
• Food inspectors found evidence of someone adulterating the milk supply.
• The scandal involved adulterating expensive spices with sawdust and artificial coloring.
• Adulterating prescription drugs is a serious federal crime.
• The manufacturer was accused of adulterating the paint with harmful chemicals.
• Testing revealed that criminals were adulterating the heroin with dangerous substances.