Fledge

глагол 1) выкармливать птенцов (до тех пор, пока они сами не смогут летать) 2) выстилать пухом и перьями (гнездо) 3) оперять (стрелу)

Большой англо-русский словарь

Fledge

verb (fledged; fledging) Etymology: fledge capable of flying, from Middle English flegge, from Old English -flycge; akin to Old High German flucki capable of flying, Old English flēogan to fly — more at fly intransitive verb of a young bird to acquire the feathers necessary for flight or independent activity; also to leave the nest after acquiring such feathers transitive verb 1. to rear until ready for flight or independent activity 2. to cover with or as if with feathers or down 3. to furnish (as an arrow) with feathers

Энциклопедический словарь Мерриама-Вебстера