The Collaborative International Dictionary of English v.0.48:

Brag \Brag\, v. t.
   To boast of. [Obs.] --Shak.
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The Collaborative International Dictionary of English v.0.48:

Brag \Brag\, n.
   1. A boast or boasting; bragging; ostentatious pretense or
      self glorification.
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            C[ae]sar . . . made not here his brag
            Of "came," and "saw," and "overcame." --Shak.
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   2. The thing which is boasted of.
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            Beauty is Nature's brag.              --Milton.
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   3. A game at cards similar to bluff. --Chesterfield.
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The Collaborative International Dictionary of English v.0.48:

Brag \Brag\, a. [See Brag, v. i.]
   Brisk; full of spirits; boasting; pretentious; conceited.
   [Archaic]
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         A brag young fellow.                     --B. Jonson.
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The Collaborative International Dictionary of English v.0.48:

Brag \Brag\, adv.
   Proudly; boastfully. [Obs.] --Fuller.
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The Collaborative International Dictionary of English v.0.48:

Brag \Brag\, v. i. [imp. & p. p. Bragged; p. pr. & vb. n.
   Bragging.] [OE. braggen to resound, blow, boast (cf. F.
   braguer to lead a merry life, flaunt, boast, OF. brague
   merriment), from Icel. braka to creak, brak noise, fr. the
   same root as E. break; properly then, to make a noise, boast.
   ?95.]
   To talk about one's self, or things pertaining to one's self,
   in a manner intended to excite admiration, envy, or wonder;
   to talk boastfully; to boast; -- often followed by of; as, to
   brag of one's exploits, courage, or money, or of the great
   things one intends to do.
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         Conceit, more rich in matter than in words,
         Brags of his substance, not of ornament. --Shak.
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   Syn: To swagger; boast; vapor; bluster; vaunt; flourish; talk
        big.
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WordNet (r) 3.0 (2006):

brag
    adj 1: exceptionally good; "a boss hand at carpentry"; "his brag
           cornfield" [syn: boss, brag]
    n 1: an instance of boastful talk; "his brag is worse than his
         fight"; "whenever he won we were exposed to his gasconade"
         [syn: brag, bragging, crow, crowing, vaporing,
         line-shooting, gasconade]
    v 1: show off [syn: boast, tout, swash, shoot a line,
         brag, gas, blow, bluster, vaunt, gasconade]