blow (one's) own horn
To boast or brag about one's own abilities, skills, success, achievements, etc. I don't mean to blow my own horn, but this pasta sauce I made is quite delicious! I can't stand being around Marcus ever since his company became such a massive success. The guy just can't stop blowing his own horn! Don't blow your own horn about all the awards you've won, OK? It's unbecoming.
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