1. To extinguish something, especially a flame. In this usage, a noun or pronoun 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. That loss snuffs out their chances to make the playoffs.

2. To kill someone. In this usage, a name, noun, or pronoun can be used between "snuff" and "out." He was planning on going to the police, but the criminals snuffed him out before he had the chance. Tragically, he was snuffed out in his prime by cancer.