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1. Get rid of (someone who may be a threat) by killing
   - neutralize, liquidate, waste, knock off, do in
    
2. Make incapable of military action
   - neutralize
    
3. Make ineffective by counterbalancing the effect of
   - neutralize, nullify, negate
    
4. Make chemically neutral
   "She neutralised the solution"
   - neutralize
    
5. Make politically neutral and thus inoffensive
   "The treaty neutralised the small republic"
   - neutralize
    
6. Oppose and mitigate the effects of by contrary actions
   - counteract, countervail, neutralize, counterbalance

Derived forms: neutralises, neutralised, neutralising

See also: neutralisation [Brit]

Type of: alter, cancel, change, demilitarise [Brit], demilitarize, kill, modify, offset, set off, weaken