Snuff it
Definition 1 of 1
Pro Tip 1/3Colloquial Humor
Used informally, often to add humor to a sad topic like death. 
When the goldfish snuffed it, we held a funny little funeral.
Pro Tip 2/3Mild Euphemism
A light-hearted way to avoid direct mention of death. 
Our office plant has snuffed it, despite our best efforts.
Pro Tip 3/3Not For Formality
Avoid in formal situations or official documents, where it's inappropriate. 
He didn't actually say 'snuffed it' in the meeting, did he?