neutralize

(verb) make politically neutral and thus inoffensive. Example: "The treaty neutralized the small republic."

(verb) make ineffective by counterbalancing the effect of. Synonyms: neutralise, nullify, negate. Examples: "Her optimism neutralizes his gloom." "This action will negate the effect of my efforts."

(verb) oppose and mitigate the effects of by contrary actions. Synonyms: counteract, countervail, counterbalance. Example: "This will counteract the foolish actions of my colleagues."

(verb) get rid of (someone who may be a threat) by killing. Synonyms: neutralise, liquidate, waste, knock off, do in. Examples: "The mafia liquidated the informer." "The double agent was neutralized."

(verb) make incapable of military action. Synonyms: neutralise.

(verb) make chemically neutral. Synonyms: neutralise. Example: "She neutralized the solution."