WordWeb Online

1. Put out, as of fires, flames, or lights
   "snuff out the candles";
   - extinguish, quench
    
2. [informal] Put an end to; kill
   "The Nazis snuffed out the life of many Jewish children";
   - extinguish

Derived forms: snuffing out, snuffed out, snuffs out

Type of: do away with, eliminate, extinguish, get rid of

Antonym: light