blow own horn
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blow (one's) own horn
To boast or brag about one's own abilities, skills, success, achievements, etc. Primarily heard in UK. 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!
blow one's own hornand toot one's own horn
Fig. to brag. Gary sure likes to toot his own horn. "I hate to blow my own horn," said Bill, "but I am always right."