All their children have 'flown the coop'. [=have moved away from home]
Her books are filled with abstract ideas and 'high-flown' language.
In the morning the suspect had 'flown the coop'.
(..) Oh, OK. Should I come back? I don't want to interrupt. No, it's no secret. Adriana has left Pablo, and has flown to Africa with Hemingway. Sabía que tenía obsesión con este fanfarrón! (I knew that I had an obsession with that bully!) Ya hemos hablado de todo esto! (We talked about all this!) (..)2011 Midnight in Paris