adulterate

If there were a law to punish those who adulterate or falsify "truth," our magistrates would be kept extremely busy.

Thou shalt not adulterate thy mess tin by using it as a shaving mug.

Moreover, a neighbor may pollute the water supply, foul the air, and adulterate the food.

It is, of course, illegal to adulterate milk, yet it is sometimes done.

The most convenient and possibly the most common materials used to adulterate milk are water and skim milk.