speak too much in praise of oneself,one's family,country, etc.
"his brag is worse than his fight"
"whenever he won we were exposed to his gasconade"
"a boss hand at carpentry"
"his brag cornfield"
Caesar's thrasonical brag of 'I came, saw, and overcame'.
出自:As You Like It , Shakespeare
Beauty is nature's brag.
出自: Milton