Identify the euphemism in the following passage:
I learned today, with great sadness, that the elderly patient passed away last evening. He was a pleasant, amiable gentleman and will truly be missed by everyone at the hospital.

“Passed away” is a euphemism for “died.”
A euphemism is a mild, indirect, or vague term that has been substituted for one that is considered harsh, blunt, or insensitive. Other examples of euphemisms include:
“Letting someone go” instead of firing someone
“Bought the farm” instead of died
“Over the hill” instead of old