The Oxford Thesaurus An A-Z Dictionary of Synonyms - boast n.

1) brag, bragging: They did not make good their boasts of being the fastest in the competition. --v. 2) brag, vaunt, crow, show off, Colloq US blow or toot one's (own) horn or trumpet; Slang lay it on thick, talk big: He boasted that he was the best poker player in the casino.