One of the mysteries of the English language finally explained.
Fully covered in feathers; specifically (of a bird) having feathers and wing muscles sufficiently developed for flight; able to leave the nest; (figurative) well-developed, well-established. Also of an arrow: = well-fletched.
Mid 17th century; earliest use found in Robert Baron (bap. 1630, d. 1658), poet and playwright. From well + fledged.
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