neutralise

Verb
  1. Get rid of (someone who may be a threat) by killing (synset 201329983)
    "The mafia liquidated the informer"; "the double agent was neutralized"
  2. Make incapable of military action (synset 201120349)
  3. Make ineffective by counterbalancing the effect of (synset 200471015)
    "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts"
  4. Make chemically neutral (synset 200470835)
    "She neutralized the solution"

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