Definitions:

1. A British informal or slang expression meaning to die or pass away. VERB
   • Sadly, the old man snuffed it peacefully in his sleep last night.
2. Pass from physical life and lose all bodily attributes and functions necessary to sustain life. VERB
   • The disease spread rapidly snuffing it out lives like a wildfire.

Synonyms:

• croak
• die
• pass on
• Perish