| 1. | the charred or partly consumed portion of a candlewick. |
| 2. | a thing of little or no value, esp. if left over. |
| 3. | to cut off or remove the snuff of (candles, tapers, etc.). |
| 4. | snuff out,
|

snuff (snŭf)
v. snuffed, snuff·ing, snuffs
To inhale something audibly through the nose; sniff. n.
A preparation of finely pulverized tobacco that can be drawn up into the nostrils by inhaling.
A medicated powder inhaled through or blown into the nose.
snuff out
Extinguish, put a sudden end to, as in Three young lives were snuffed out in that automobile accident. This usage alludes to snuff in the sense of "put out a candle by pinching the wick," an area itself called snuff from the late 1300s on. [Mid-1800s]
Kill, murder, as in If he told the police, the gang would snuff him out. [Slang; first half of 1900s]
Also, snuff it. Die or be killed, as in He looked very ill indeed, as though he might snuff out any day, or Grandpa just snuffed it. [Slang; second half of 1800s]