[no obj.](of a young bird) develop wing feathers that are large enough for flight (幼鸟)长出飞羽 ■[with obj.]bring up (a young bird) until its wing feathers are developed enough for flight 把(幼鸟)养至长出飞羽
语源
mid 16th cent.: from the obsolete adjective fledge 'ready to fly', from Old English, of Germanic origin; related to Dutch vlug 'quick, agile', also to fly