neutralize

Verb

• make politically neutral and thus inoffensive
  • "The treaty neutralized the small republic"
• make ineffective by counterbalancing the effect of
  • "Her optimism neutralizes his gloom"
• oppose and mitigate the effects of by contrary actions
• get rid of (someone who may be a threat) by killing
  • "the double agent was neutralized"
• make incapable of military action
• make chemically neutral
  • "She neutralized the solution"
• To make even, inactive or ineffective.
• To make (a territory, etc.) politically neutral.
• To make (an acidic or alkaline substance) chemically neutral.
• To kill.

Examples

• The antidote neutralised the toxin.

Synonyms

counteract, counterbalance, countervail, do in, knock off, liquidate, negate, neutralise, nullify, waste, counterweigh