Defile means to

• A. to spoil something by making it less pure; to corrupt
• B. to purify or cleanse
• C. to decorate
• D. to erase

Answer: (A)

Defile describes making something impure or contaminated, often with a sense of violation or dishonor. The best fit is to spoil something by making it less pure; to corrupt, because it captures both physical impurity and the idea of disrespectful damage to something considered sacred or worthy of protection.

The other options don’t fit because they imply opposite or unrelated actions: purifying or cleansing would remove impurity, decorating adds adornment, and erasing removes or wipes away rather than contaminating or corrupting. In usage, you might say a shrine was defiled or polluted waters defile the landscape, underscoring the intrusion of impurity or disrespect.