neutralise
     v 1: get rid of (someone who may be a threat) by killing; "The
          mafia liquidated the informer"; "the double agent was
          neutralized" [syn: {neutralize}, {liquidate}, {waste}, {knock
          off}, {do in}]
     2: make incapable of military action [syn: {neutralize}]
     3: make ineffective by counterbalancing the effect of; "Her
        optimism neutralizes his gloom"; "This action will negate
        the effect of my efforts" [syn: {neutralize}, {nullify}, {negate}]
     4: make chemically neutral; "She neutralized the solution"
        [syn: {neutralize}]
Source: WordNet® 2.0