neutralize
verb
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make chemically neutral“The acid was neutralized.”
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make ineffective by counterbalancing the effect of“Your optimism neutralizes their gloom.”nullifynegate
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make incapable of military action
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get rid of (someone who may be a threat) by killingwaste
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make politically neutral and thus inoffensive“The treaty neutralized the small republic”
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oppose and mitigate the effects of by contrary actionscounterbalance