blow one's own horn
To brag about oneself: “Although usually modest, Marilyn had to blow her own horn a bit during the job interview.” Sometimes phrased as “toot one's own horn.”
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Words nearby blow one's own horn
Idioms and Phrases with blow one's own horn
Also, blow one's trumpet. Brag about oneself, as in Within two minutes of meeting someone new, Bill was blowing his own horn. [Late 1500s]