hide one’s light under a bushel;not to show off one’s knowledge ❍ 他的朋友们都劝他小心谨慎，～。All his friends advised him to be very cautious and hide his light under a bushel.
不露圭角bù lù ɡuī jiǎo
形容不露锋芒。hide one’s light under a bushel, not to show off one’s knowledge