Fledged
来自Big Physics
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mid 16th century: from the obsolete adjective fledge ‘ready to fly’, from Old English, of Germanic origin; related to Dutch vlug ‘quick, agile’, also to fly1.
etymonline
fledged (adj.)
"furnished with feathers," 1570s (in full-fledged), thus "developed, matured, able to fly;" past-participle adjective from fledge (v.).