Find the word definition

Wiktionary
empty nest syndrome

n. a feeling of loneliness or depression experienced by some parents when their children have matured and left home

Wikipedia
Empty nest syndrome

Empty nest syndrome is a feeling of grief and loneliness parents may feel when their children leave home for the first time, such as to live on their own or to attend a college or university. It is not a clinical condition.

Since young adults moving out from their families house is generally a normal and healthy event, the symptoms of empty nest syndrome often go unrecognized. This can result in depression and a loss of purpose for parents, since the departure of their children from "the nest" leads to adjustments in parents' lives. Empty nest syndrome is especially common in full-time mothers.

Usage examples of "empty nest syndrome".

He'll be starting college in the fall and then Tab and I will have to start dealing w/ the ever-popular Empty Nest Syndrome.