The Collaborative International Dictionary of English v.0.48:

Fledge \Fledge\, a. [OE. flegge, flygge; akin to D. vlug, G.
   fl["u]gge, fl["u]cke, OHG. flucchi, Icel. fleygr, and to E.
   fly. [root]84. See Fly, v. i.]
   Feathered; furnished with feathers or wings; able to fly.
   [1913 Webster]

         His shoulders, fledge with wings.        --Milton.
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The Collaborative International Dictionary of English v.0.48:

Fledge \Fledge\, v. t. & i. [imp. & p. p. Fledged; p. pr. &
   vb. n. Fledging.]
   1. To furnish with feathers; to supply with the feathers
      necessary for flight.
      [1913 Webster]

            The birds were not as yet fledged enough to shift
            for themselves.                       --L'Estrange.
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   2. To furnish or adorn with any soft covering.
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            Your master, whose chin is not yet fledged. --Shak.
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WordNet (r) 3.0 (2006):

fledge
    v 1: feed, care for, and rear young birds for flight
    2: decorate with feathers; "fledge an arrow" [syn: fledge,
       flight]
    3: grow feathers; "The young sparrows are fledging already"
       [syn: fledge, feather]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "fledge":
   attain majority, bloom, come of age, come to maturity, develop,
   feather, flower, grow, grow up, leave the nest, mature, mellow,
   reach manhood, reach twenty-one, reach voting age, ripen, season,
   settle down, temper, toga virilis