2PHRASE [VERB inflects]挣脱束缚;逃离 If you say that someone has flown the coop, you mean that they have left a place or situation that limits their freedom. 挣脱束缚;逃离
...a family whose children have grown up and flown the coop.
孩子们已经长大离家开始自己生活的家庭
She graduates to senior stylist and then flies the coop to set up in a salon of her own.