To inhale (something) audibly through the nose; sniff. To sense or examine by smelling; sniff at. To sniff; inhale. The act of snuffing or the sound produced by it; a snuffle. The charred portion of a candlewick. To extinguish: snuffed out the candles. To put a sudden end to: lives that were snuffed out by car accidents. Slang To kill; murder. To cut off the charred portion of (a candlewick). A preparation of finely pulverized tobacco that can be drawn up into the nostrils by inhaling. Also called smokeless tobacco. The quantity of this tobacco that is inhaled at a single time; a pinch. A powdery substance, such as a medicine, taken by inhaling. To use or inhale snuff. up to snuff Informal Normal in health. up to snuff Informal Up to standard; adequate.