make politically neutral and thus inoffensive
"The treaty neutralized the small republic"
make ineffective by counterbalancing the effect of
"Her optimism neutralizes his gloom"
"This action will negate the effect of my efforts"
oppose and mitigate the effects of by contrary actions
"This will counteract the foolish actions of my colleagues"
get rid of (someone who may be a threat) by killing
"The mafia liquidated the informer"
"the double agent was neutralized"
make incapable of military action
To make even, inactive or ineffective.