verb (v)

• make politically neutral and thus inoffensive(verb.social)

  Example:
  The treaty neutralized the small republic.
  

  source: wordnet30
• make ineffective by counterbalancing the effect of(verb.change)

  Example:
  Her optimism neutralizes his gloom.
  

  Synonym:
  negate, neutralise, nullify
  

  source: wordnet30
• oppose and mitigate the effects of by contrary actions(verb.social)

  Synonym:
  counteract, counterbalance, countervail
  

  source: wordnet30
• get rid of (someone who may be a threat) by killing(verb.contact)

  Example:
  The double agent was neutralized.
  

  Synonym:
  do in, knock off, liquidate, neutralise, waste
  

  source: wordnet30
• make incapable of military action(verb.competition)

  Synonym:
  neutralise
  

  source: wordnet30
• make chemically neutral(verb.change)

  Example:
  She neutralized the solution.
  

  source: wordnet30
• To render neutral; to reduce to a state of neutrality.(verb)

  source: webster1913