smart alec
聪明才智过人的人，常常自大或爱显摆
口语·略带贬义
英文释义
someone who is excessively clever or confident, often in a sarcastic or irritating way
例句
He's such a smart alec, always correcting everyone in meetings.
典故来源
源自19世纪美国，'Alec'是Alexander的昵称，指自以为聪明、爱炫耀的人。