fully-fledged russian

• полноце́нный

  of full value (fully-fledged)

• опери́ться

  to grow feathers, to become fledged, to fledge

  to become fully fledged, to become independent, to stand on one's own feet

Examples

• Птенцы уже оперились и готовы летать.

  The chicks are fully fledged now and ready to fly.