Answer: fledging

AnswerCrossword Clue
FLEDGINGReaching maturity
fledgingBring up (a young bird) until its wing feathers are developed enough for flight
fledgingProvide (an arrow) with feathers
fledging(of a young bird) Develop wing feathers that are large enough for flight
fledgingFLEDGE, to furnish with feathers