The definition of boast means to brag about oneself or have something.(verb)
An example of boast is a sales person gloating about how many sales they made in a month.
See boast in Webster's New World College Dictionary
Origin: < ?
Origin: ME bosten < bost, n. < Anglo-Fr; prob. via Gmc *bausia- (cf. Norw baus, bold, haughty), ult. < IE *bhōu-, var. of base *bheu-, to grow, swell > be
See boast in American Heritage Dictionary 4
verb boast·ed, boast·ing, boasts verb, intransitive
Origin: Middle English bosten
Origin: , from bost, a brag.
transitive verb boast·ed, boast·ing, boasts
Origin: Origin unknown.
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