每日商務英語 第423期:極度自負

to get a big head 極度自負（成語）

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To get too high an opinion of one’s ability, power, or importance; to become arrogant.

例句
After his promotion at work, the young man got a big head and started telling everyone he was much more talented than the boss.

在得到晉職後，這位年輕人變得極度自負，開始逢人就說，他的能力遠超過老闆。