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'.
(..) That's a Chinese station. - Yes. You're gonna take the Soyuz, and you're gonna cruise over there. Chinese lifeboat is a Shenzhou. I've never flown a Shenzhou. - It doesn't matter. Its re-entry protocol is identical to the Soyuz. Okay. You never flown the Soyuz either? (..)2013 Gravity