TO BLOW (or SOUND) ONE’S OWN TRUMPET, verb. phr. (old).—To praise (or talk about) oneself, to brag (GROSE). Hence ‘His TRUMPETER is dead’ (of a braggart).

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  1871.  Times, 4 Nov. When a gentleman began by BLOWING HIS OWN TRUMPET, it was not altogether jannock.

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