Source : Webster's Revised Unabridged Dictionary (1913)

Boast \Boast\, v. t. [Of uncertain etymology.]
   1. (Masonry) To dress, as a stone, with a broad chisel.
      --Weale.

   2. (Sculp.) To shape roughly as a preparation for the finer
      work to follow; to cut to the general form required.

Boast \Boast\, n.
   1. Act of boasting; vaunting or bragging.

            Reason and morals? and where live they most, In
            Christian comfort, or in Stoic boast! --Byron.

   2. The cause of boasting; occasion of pride or exultation, --
      sometimes of laudable pride or exultation.

            The boast of historians.              --Macaulay.

Boast \Boast\, v. i. [imp. & p. p. {Boasted}; p. pr. & vb. n.
   {Boasting}.] [OE. bosten, boosten, v., bost, boost, n.,
   noise, boasting; cf. G. bausen, bauschen, to swell, pusten,
   Dan. puste, Sw. pusta, to blow, Sw. p["o]sa to swell; or W.
   bostio to boast, bost boast, Gael. bosd. But these last may
   be from English.]
   1. To vaunt one's self; to brag; to say or tell things which
      are intended to give others a high opinion of one's self
      or of things belonging to one's self; as, to boast of
      one's exploits courage, descent, wealth.

            By grace are ye saved through faith; and that not of
            yourselves: . . not of works, lest any man should
            boast.                                --Eph. ii. 8,
                                                  9.

   2. To speak in exulting language of another; to glory; to
      exult.

            In God we boast all the day long.     --Ps. xliv. 8

   Syn: To brag; bluster; vapor; crow; talk big.

Boast \Boast\, v. t.
   1. To display in ostentatious language; to speak of with
      pride, vanity, or exultation, with a view to
      self-commendation; to extol.

            Lest bad men should boast Their specious deeds.
                                                  --Milton.

   2. To display vaingloriously.

   3. To possess or have; as, to boast a name.

   {To boast one's self}, to speak with unbecoming confidence
      in, and approval of, one's self; -- followed by of and the
      thing to which the boasting relates. [Archaic]

            Boast not thyself of to-morrow.       --Prov. xxvii.
                                                  1

Source : WordNet®

boast
     n : speaking of yourself in superlatives [syn: {boasting}, {self-praise},
          {jactitation}]
     v 1: show off [syn: {tout}, {swash}, {shoot a line}, {brag}, {gas},
           {blow}, {bluster}, {vaunt}, {gasconade}]
     2: wear or display in an ostentatious or proud manner; "she was
        sporting a new hat" [syn: {sport}, {feature}]