(Vieux) Falsifier.
To add water to a mixture to dilute it; SYN. stretch, water down, dilute, debase.
Corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones
(Alternate spelling: adulterise).
To commit adultery.
1. To adulterate the purity of.
2. To make impure in a figurative sense.
3. To make radioactive by adding radioactive material.