Unfortunately, you can't shut them up. Such people are seeking recognition for what they do and are trying to attract it through boasting about their accomplishments.
To brag is to boast or speak proudly about one's accomplishments, possessions, or abilities in order to impress others or gain admiration. It often involves exaggerating one's achievements or qualities.
Emma loved to boast about her dog Princess.
Yes, it is a form of the verb "to boast" (express self-admiration for one's accomplishments). It is the past tense and past participle, but not used as an adjective except with a variant meaning (to shape with a chisel).
boast
BOAST: -verb (used without object) 1. to speak with exaggeration and excessive pride, esp. about oneself.2. to speak with pride (often fol. by of): He boasted of his family's wealth. -verb (used with object) 3. to speak of with excessive pride or vanity: He boasts himself a genius.4. to be proud in the possession of: The town boasts a new school. -noun 5. a thing boasted of; a cause for pride: Talent is his boast. It is her boast that she has never betrayed a friend.6. exaggerated or objectionable speech; bragging: empty boasts and threats.
It means to brag or boast about ones' self, rather than letting other people say good things about you. Usually, when people brag or boast they exaggerate their own accomplishments or virtues, to make themselves look good. If I hear a third person say something good about you, I am more likely to believe what they say, than if I hear it from you. An independent reporter is more believable than the person themselves.
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Russell Boast's birth name is Russell John Boast.
I suppose that a pen and a sword, if we imagine them to be alive, might wish to debate the claim that the pen is mightier than the sword. Each can boast of their accomplishments and power.
One may use any of several prepositions with the verb to boast, including:boast of (deeds, exploits)boast about (abilities, charcateristics)boast to (anyone listening)boast among (ones peers, or a group)
Ghost boast
Will Boast has written: 'Power ballads'