短语 to fly the nest1 的意思是一个人离开爸爸妈妈开始自己独立的生活。
例句
When David started university he had to fly the nest and live alone.
All the children have flown the nest so Mum now has a lot of spare time.
请注意
A nest egg 的意思是存款、储备金。
Jane is going to use her nest egg to buy a big house by the sea.