neutralize in WordNet English dictionary

1. oppose and mitigate the effects of by contrary actions
   "This will counteract the foolish actions of my colleagues"
   counteract  countervail  neutralize  counterbalance 
   
2. get rid of (someone who may be a threat) by killing
   "The mafia liquidated the informer"; "the double agent was neutralized"
   neutralize  neutralise  liquidate  waste  knock off  do in 
   
3. make ineffective by counterbalancing the effect of
   "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts"
   neutralize  neutralise  nullify  negate 
   
4. make chemically neutral
   "She neutralized the solution"
   neutralize  neutralise 
   
5. make incapable of military action
   neutralize  neutralise 
   
6. make politically neutral and thus inoffensive
   "The treaty neutralized the small republic"
   neutralize