The Collaborative International Dictionary of English v.0.48:

Vaunt \Vaunt\ (v[aum]nt or v[add]nt; 277), v. i. [imp. & p. p.
   Vaunted; p. pr. & vb. n. Vaunting.] [F. vanter, LL.
   vanitare, fr. L. vanus vain. See Vain.]
   To boast; to make a vain display of one's own worth,
   attainments, decorations, or the like; to talk
   ostentatiously; to brag.
   [1913 Webster]

         Pride, which prompts a man to vaunt and overvalue what
         he is, does incline him to disvalue what he has. --Gov.
                                                  of Tongue.
   [1913 Webster]