Other forms: neutralized; neutralizing; neutralizes
When you neutralize something, you make it harmless or ineffective — usually by applying its opposite force, like pouring water on a fire.
The world neutral was first used to describe a country that doesn’t take sides in a war, like Switzerland. There’s something kind of noble about a country that doesn’t participate in war by choice, but when we say something has been neutralized — that usually means that its power has been taken away from the outside.