What does "boast" mean?

Additional senses

1. 2.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. 3.To display vaingloriously.
3. 4.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.
4. 5.(Masonry) To dress, as a stone, with a broad chisel. Weale.
5. 6.(Sculp.) To shape roughly as a preparation for the finer work to follow; to cut to the general form required.
6. 7.Act of boasting; vaunting or bragging. Reason and morals and where live they most, In Christian comfort, or in Stoic boast! Byron.
7. 8.The cause of boasting; occasion of pride or exultation, -- sometimes of laudable pride or exultation. The boast of historians. Macaulay.