neutralize

transitive verb neutralized, neutralizing

1. to declare (a territory, nation, etc.) neutral in war; declare open to all nations under international law and exempt from attack
2. to make ineffective; destroy or counteract the effectiveness, force, disposition, etc. of
3. Chem. to destroy the distinctive or active properties of: an alkali neutralizes an acid
4. Elec. to make electrically neutral

Origin: Fr neutraliser