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'.
(..) was treated with some kind of toxin. They poisoned it? - Not according to them. - What did they say? Not much. They're being flown up here tomorrow... and on Wednesday at , you'll catch a transport down to Cuba for the day... to find out what you can. Meantime, go and see (..)1992 A Few Good Men