adulterate
verb
adul·ter·ate
| \ ə-ˈdəl-tə-ˌrāt
\
\
adulterated;
adulterating
Definition of adulterate
(Entry 1 of 2)
: to corrupt, debase, or make impure by the addition of a foreign or inferior substance or element
especially
: to prepare for sale by replacing more valuable with less valuable or inert ingredients
He was in the same plight as the manufacturer who has to adulterate and misrepresent his product. If he does not, some one else will. — Upton Sinclair