Wiktionary
vb. (context euphemistic colloquial English) to die.
WordNet
v. die; "The old man finally kicked the bucket" [syn: kick the bucket, cash in one's chips, buy the farm, conk, give-up the ghost, drop dead, pop off, choke, croak]
Usage examples of "snuff it".
Why is it, he wondered, that the more helpless a creature, the easier it was for some people to snuff it?
If there remain'd a farthing candle between us and Monongahela yet unsnuff'd, be certain, Ensign Enthusiasm here would find and snuff it.
We will snuff it, we will see what it is that threatens and beckons.
I could not help but perceive how little sanity was left to her, for all her uninjured body, and how the Combat would surely snuff it out whether or not she survived physically.
Have you got any idea of what's going to become of the intrinsic energy of the vortex when I snuff it?