debase

添加人工香料会降低蜂蜜的品质。

Adding artificial flavors will ___debase the quality of the honey.

一些不诚实的商人通过掺杂廉价原料来降低银的纯度。

Some dishonest merchants ___debase silver by mixing it with cheaper materials.

这些虚假广告降低了产品的信誉。

These fake ads ___debase the product's reputation.