What is the meaning of Boast?

A brag; ostentatious positive appraisal of oneself.

Something that one brags about.

A shot where the ball is driven off a side wall and then strikes the front wall.

To brag; to talk loudly in praise of oneself.

(used with "about" or "of") To speak of with pride, vanity, or exultation, with a view to self-commendation; to extol.

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

To play a boast shot.

To possess something special (e.g. as a feature).

To dress, as a stone, with a broad chisel.

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

Source: wiktionary.org