To trumpet one's good deeds. The allusion is to the Pharisaic
sect called the Almsgivers, who had a trumpet sounded before
them, ostensibly to summon the poor together, but in reality to publish
abroad their abnegation and benevolence.
You sound your own trumpet.
The allusion is to heralds, who used to announce with a flourish of
trumpets the knights who entered a list.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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