Depart this life
Definition 1 of 1
Pro Tip 1/3Archaic Usage
This phrase is old-fashioned and rarely used in everyday conversation. 
In old literature, characters often departed this life surrounded by family.
Pro Tip 2/3Serious Tone
Used to give a serious or respectful tone when talking about death. 
At the funeral, the eulogy mentioned how he had departed this life too soon.
Pro Tip 3/3Euphemistic Expression
It's a gentle way of saying someone has died, often used to soften the harshness. 
The family said their beloved grandmother had departed this life after a long illness.