adulterate

Definition

To mix or add something unhealthy, unpleasant, or degrading to something good, especially so that it becomes unsatisfactory or unpleasant in quality or effect, in character, or in spirit.

中文 混合或添加某物不健康、不愉快或有贬义的东西,使其变得不满意或不愉快的质量或效果,在性格或精神上。

Example

"She refused to eat the store's adulterated milk, which was found to be past its fresh shelf life."