The term 'blow one's own horn' is an idiom that means to BOAST or BRAG about oneself. This phrase can be broken down into three crossword solutions: TOOT (4 letters), BOAST (5 letters), and BRAG (4 letters). TOOT is a verb meaning to make a loud, short sound with a horn or trumpet. BOAST is a verb meaning to talk with excessive pride and self-satisfaction about one's achievements, possessions, or abilities. BRAG is a verb meaning to BOAST or talk with excessive pride and self-satisfaction about one's achievements, possessions, or abilities. All three words are synonyms for the phrase 'blow one's own horn'.