NEUTRALIZES

Make politically neutral and thus inoffensive

Example: "The treaty neutralized the small republic"

Make ineffective by counterbalancing the effect of

Example: "Her optimism neutralizes his gloom"

Oppose and mitigate the effects of by contrary actions

Example: "This will counteract the foolish actions of my colleagues"

Get rid of (someone who may be a threat) by killing

Example: "The mafia liquidated the informer"

Make incapable of military action

Make chemically neutral

Example: "She neutralized the solution"