blow one’s horn 自吹自擂
A:David, do you agree that I’m cleverer than you?
B:I’m afraid not.
A:Don't you know I won the first prize in the contest?
B:Everyone knows it; stop blowing your own horn.
A:大卫,你同不同意我比你聪明这一点?
B:恐怕不。
A:你不知道我在比赛中得了第一名吗?
B:人人都知道,你别再自吹自擂了。