snuff 2 
(snŭf)
(snŭf)n.
The charred portion of a candlewick.
tr.v. snuffed, snuff·ing, snuffs
1. To extinguish: snuffed out the candles.
2. To put a sudden end to: lives that were snuffed out by car accidents.
3. Slang To kill; murder.
4. To cut off the charred portion of (a candlewick).
[Middle English snoffe, possibly of Low German origin.]