The definition of toot one’s own horn is:
(verb) to display one’s achievements or good characteristics to make others feel bad
A: How is your new teacher?
B: He spent the first hour of class tooting his own horn by talking about his degrees, his books, his sports car and his beautiful wife. I dislike him a lot!
The young woman tooted her own horn by showing her expensive new iPhone to her jealous friends.
A: Did you get a good score on the TOEFL test?
B: I don’t want to toot my own horn, but I did fantastically!
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