A bird is fledged when it has grown its flight feathers, though it doesn't leave the nest until is feels the urge to go, and untilthose feathers are strong enough to bear its weight. Fledgelings are young birds with those flight feathers, but they may still be living in the nest for a while (like teenagers)
and will soon take off.
A craftsman who makes arrows is a fletcher (using feathers at the back end of the arrow to keep it in a straight line in flight).
The link from the word is to feathers, rather than to total independence, and the word fled is the past of flee, not to fledge.
Why doesn't Starmer hold another referendum?





