snuff someone out
1. To extinguish something, especially a flame. In this usage, a noun can be used between "snuff" and "out." She snuffed the flame of the candle out between her fingers. The system uses halon gas to snuff out fire before it has a chance to spread.
2. To kill or murder someone. In this usage, a name, noun, or pronoun can be used between "snuff" and "out." The president has been accused of snuffing out a journalist who was investigating his financial ties to foreign dictatorships. He was planning on going to the police, but the criminals snuffed him out before he had the chance.
snuff someone (out)
tv. to kill someone. Max really wanted to snuff the eyewitness out, once and for all.