Open English Wordnet
Verbs
(v)neutralize, neutralise, liquidate, waste, knock off, do inget rid of (someone who may be a threat) by killing“The mafia liquidated the informer”, “the double agent was neutralized”
(v)neutralize, neutralise, nullify, negatemake ineffective by counterbalancing the effect of“Her optimism neutralizes his gloom”, “This action will negate the effect of my efforts”