blow one's own horn

Cultural  

1. 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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blow one's own horn Idioms  

1. 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]

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