to leave your parents' home for the first time in order to live somewhere else.
Once the kids have all flown the nest we might sell this house and move somewhere smaller.
leave the nest
To move out of one's parents home for the first time, most typically when going into third-level education. I can't believe my little girl is getting ready to leave the nest. I'm so proud and so sad all at once!While it is liberating for most teenagers, leaving the nest can be a very emotionally challenging period in one's life.