neutralise

Verb

• make chemically neutral
  • She neutralized the solution
    

• make ineffective by counterbalancing the effect of
  • Her optimism neutralizes his gloom
    
  • This action will negate the effect of my efforts
    

• make incapable of military action

• get rid of (someone who may be a threat) by killing
  • The mafia liquidated the informer
    
  • the double agent was neutralized
    

Related words

• Synonyms: 
  neutralize , nullify , negate , liquidate , waste , knock off , do in