尔虞我诈

1. • lit. you hoodwink me and I cheat you (idiom)
2. • fig. each tries to outwit the other
3. • deceit and treachery

Character by character

• 尔(ěr)thus
• 虞(yú)surname Yu
• 我(wǒ)I
• 诈(zhà)cheat