Definition
To exhibit an excessive and irritating level of self-confidence in one's own intelligence.
聰明反被聰明誤
He's always trying to point out others' mistakes in meetings, he's being too clever by half.
他總是在會議上指出別人的錯誤，真是聰明過頭了。
She thinks she knows everything, but her suggestions are actually unhelpful; she is too clever by half.
她以為自己無所不知，但她的建議其實沒什麼幫助；她聰明過頭了。
Stop showing off your petty cleverness; you're just making yourself annoying.
別再炫耀你的小聰明了；你只是讓自己變得討人厭。