What does "passed away" mean?

It is very bad to passed away before your time.

     One of my classmates passed away 6 years ago.at that time he was a college student.One day he came to dormitory.Suddenly he felt faint for a moment.His roommates called a ambulance in hurry.Then he was taken to the hospital.Finally,Since that he never recovered.His parents felt very sad and almost cracked up.He was the only boy in his family.He always kept fit.Noone knows what’s the matter with him.Some people guess may be he ate some dirty food,Because there are many problems about food safety in China recent years.

peaple do not like passed away

my grandmother passed away couple of years ago due to heart deaseas….......

My friend in high school passed away by gas when he and his family slept in home

One of my best friends passed away when I was just 10! Since that time I never forgot him :(